Master Windows 11 File Compression: Native ZIP, 7 Zip, Robocopy Tips

Windows 11’s File Explorer has quietly become a real contender for everyday compression tasks, but if you move large files regularly you’ll save the most time by combining the built‑in tools with a few proven power‑user techniques and third‑party utilities. This article distills the step‑by‑step methods, explains when to use Windows’ native “Compress” flow versus 7‑Zip and Robocopy, and lays out practical hardware and workflow tweaks that cut transfer time without sacrificing safety or compatibility.

Background​

Windows has supported ZIP files for decades, but recent Windows 11 updates broadened native archive support and added convenience features that matter for large transfers. Microsoft’s support documentation now shows that Windows 11, version 24H2, recognizes and can create and extract multiple archive formats — including ZIP, RAR, 7z and TAR — while noting limitations around encrypted archive creation and manipulation. Third‑party archivers remain essential for advanced tasks. 7‑Zip’s 7z format offers higher compression ratios and AES‑256 encryption, and tools such as WinRAR, Bandizip and PeaZip provide format breadth, speed tuning and split‑archive features that the native tools don’t. The official 7‑Zip documentation outlines LZMA/LZMA2 compression, multi‑threading and AES‑256 support — features that make it a go‑to option when file size or security is important. Community testing and hands‑on guides also stress that compression is only one part of the transfer equation. Hardware (SSDs vs HDDs), connection type (USB 2.0 vs USB 3.x / USB‑C), file system (NTFS vs FAT32), background services (cloud sync, antivirus), and the copy tool you choose (File Explorer vs Robocopy with /MT) all influence end‑to‑end speed. Practical community tips and benchmark summaries show that combining compression with a fast copy method often delivers the best real‑world outcome.

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What changed in Windows 11 (and why it matters)​

Native archive support and the “Create Archive” wizard​

Microsoft has expanded File Explorer’s archive capabilities. On systems updated to Windows 11, version 24H2, File Explorer includes a “Create Archive” experience that can generate common formats such as Zip, 7z and Tar directly from the right‑click menu. This reduces friction for quick, lightweight archives without installing extra software — useful when you want a single file container fast. However, the native UI deliberately omits encrypted archive creation; for password‑protected archives you still need dedicated tools.

Usability tweaks that speed workflows​

Windows 11’s File Explorer improvements — cleaner context menus, better “Show more options” behavior and faster explorer preload in recent builds — mean fewer clicks and slightly faster interaction for just‑in‑time compression. These quality‑of‑life upgrades matter when you’re archiving dozens of folders per day.

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The smart ways to zip files in Windows 11 (step‑by‑step)​

Below are practical, reproducible methods ranked by speed/complexity tradeoffs: quick built‑in zips, higher compression/security with 7‑Zip, and best‑throughput workflows for very large transfers.

1) Quick: Built‑in ZIP from File Explorer (fastest for small jobs)​

Use Windows’ native flow for small folders or when you need compatibility and zero installs.

1. Select files or folder in File Explorer.
2. Right‑click → Show more options → Send to → Compressed (zipped) folder.
3. Rename the resulting .zip file as needed.

This is the fastest route for basic, non‑encrypted archives and benefits from immediate compatibility with Windows systems and most recipients. For large collections it’s convenient, but comprehension: built‑in ZIP offers limited compression tuning and does not create AES‑encrypted archives.

2) Pro compression and encryption: 7‑Zip (best balance of size and security)​

7‑Zip gives you the best compression ratios in many scenarios and supports AES‑256 encryption for confidentiality.

• Install 7‑Zip and use the context menu: Right‑click → Show more options → 7‑Zip → Add to archive.
• Recommended settings for distribution:
  • Format: 7z (best compression) or Zip for broad compatibility.
  • Compression level: Ultra or Maximum for smallest size (longer CPU time).
  • Compression method: LZMA2 (default for modern multi‑core systems).
  • Enable AES‑256 encryption if you need password protection.

7‑Zip supports solid compression and multi‑threaded compression—meaning it can use multiple CPU cores to improve throughput—while offering robust format support. Use 7z when reducing size matters (uploads, backup storage) or when encrypting the archive is required.

3) Split archives: send huge files across limits​

If an email/file share has limits, use 7‑Zip or WinRAR to create multi‑part archives (e.g., .001, .002). In 7‑Zip’s Add to archive dialog specify “Split to volumes, bytes” and enter a size like 100M or 2G to generate manageable chunks. PeaZip and WinRAR offer similar splitting controls. Community how‑tos and compressed‑file discussions show this is reliable and well supported by recipients who can reassemble with the same tool.

4) For massive transfers: compress, then copy with Robocopy (or preserve archive and stream)​

When you need to move terabytes or many thousands of files between drives or over a network, compressing first minimizes I/O overhead and consolidates many small files into one heavy stream.

• Create the archive locally using 7‑Zip.
• Use Robocopy to transfer the archive (or the original files if you prefer Robocopy’s advanced copying semantics).
• Robocopy multithread tip: use /MT[:n] to enable multi‑threaded copying; the documented default for /MT when used without a number is 8 threads, and the parameter accepts 1–128 threads. For many SSDs and modern CPUs, /MT:16 or /MT:32 can give a big speed boost, but you should experiment because excessive threads will thrash some drives or saturate a network.

Example command to copy a created archive:

1. Open administrative PowerShell or Command Prompt.
2. Run:
   1. robocopy "C:\Source" "D:\Destination" Archive.7z /Z /MT:16 /LOG:copy.log

Robocopy’s /Z (restartable) and /MT (multithread) switches help resilience and throughput during large moves. Community tests corroborate Robocopy’s performance edge for large jobs when tuned correctly.

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Hardware and system tweaks that reduce transfer time​

Even the best compression method can be throttled by slow hardware or background processes. Apply these checks before starting long jobs:

• Use SSDs (prefer NVMe) for source or destination drives; HDD speeds are often the biggest bottleneck. Modern NVMe SSDs deliver multiple GB/s, vastly outpacing HDDs.
• Connect external drives to USB 3.0/3.2 or Thunderbolt ports (look for SS or 10G/40G markings) — plugging a USB 3.x device into a USB 2.0 jack will cap throughput.
• Ensure the destination uses NTFS for large files and robust metadata handling; FAT32 caps file size at 4 GB. Convert with care: convert X: /fs:ntfs or reformat after backing up.
• Pause cloud sync (OneDrive, Dropbox) while copying; real‑time sync can cause spikes in I/O and slow transfers. Community guides consistently recommend stopping background sync during bulk moves.
• Temporarily disable real‑time antivirus only if you trust the files and will re‑enable it right after; scanning each file can significantly slow large copies. Documented tips and forum advice flag this as a practical — but risky — speed hack.

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Which format should you choose (compatibility vs. size vs. speed)​

• ZIP: Default for broad compatibility and fastest decompression on most systems. Use for general sharing. Windows’ built‑in ZIP uses the Deflate method and trades compression for maximum compatibility.
• 7z: Best compression ratio and strong AES‑256 encryption. Use when size reduction or security is required. Ideal for backups and archives intended for users who can run 7‑Zip or compatible software.
• TAR/GZ/XZ: Useful for cross‑platform workflows (Unix/Linux), but not as universally user‑friendly for casual Windows recipients.
• RAR: Historically strong, but RAR creation requires WinRAR (proprietary). Windows 11 can read some RAR files natively now, but RAR creation and encryption are handled by WinRAR.

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Critical analysis: strengths, weaknesses and risks​

Strengths of the new native approach​

• Convenience: Native creation and extraction for multiple formats reduces friction for basic archiving tasks and lowers the need to install third‑party tools for casual use.
• Integration: File Explorer changes and a streamlined context menu make quick compress/uncompress operations feel natural and faster.

When native tools fall short​

• No encrypted archive creation: Windows’ built‑in compressor does not support creating encrypted archives; that’s where 7‑Zip and WinRAR remain indispensable for confidentiality. If you need AES‑256 encryption, rely on 7‑Zip.
• Performance vs. advanced tools: Built‑in ZIP does not provide advanced compression parameters, multi‑threaded compression tuning, or fine‑grained splitting. Benchmarks shared in community reports show third‑party tools routinely outpace File Explorer on both compression speed and compressed size for large jobs. These community tests are useful but can vary by CPU, storage medium and exact settings — treat single benchmarks as indicative, not definitive.

Practical risks and caveats​

• Disabling antivirus is risky: Turning off real‑time protection speeds transfers but exposes you to threats; only do this briefly and for trusted data. Always re‑enable protections immediately after the operation.
• Multithreading tradeoffs: Robocopy’s /MT and 7‑Zip’s multithreaded compression can boost throughput, but they consume CPU and can increase random I/O on spinning disks—sometimes making transfers slower on older HDDs. Test /MT values (start with /MT:8 then tweak) and monitor disk and CPU use. Microsoft’s documentation clarifies /MT’s parameters; community tests advise balancing threads with hardware capability.
• Privacy concerns with web tools: Online compressors are convenient for one‑off small files, but uploading sensitive documents exposes them to third‑party servers. For confidential material, prefer local tools. Community guidance strongly warns against web tools for sensitive data.

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Quick reference: recommended workflows​

• Fast, small job (email attachments): Windows Explorer ZIP (built‑in).
• Reduced size + encryption for backup: 7‑Zip (.7z, LZMA2, AES‑256, Ultra).
• Many small files for transfer across network: Create one archive locally, then copy the single archive using Robocopy /MT.
• Drive‑to‑drive sync or migration: Robocopy with /MT tuned to CPU/drive, or specialized migration tools for OS‑level moves.
• Cross‑platform sharing (Linux/macOS recipients): Use TAR.GZ or ZIP depending on target platform.

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Step‑by‑step “zip like a pro” checklist​

1. Choose the right format: ZIP for general sharing, 7z for size/security.
2. If files are already compressed (MP4, JPEG, ZIP), don’t expect large wins from further compression.
3. Use SSDs and USB 3.x / Thunderbolt where possible.
4. Pause cloud sync and heavy background apps; consider briefly disabling real‑time antivirus only for trusted transfers.
5. Create the archive locally (7‑Zip: Ultra, LZMA2 for best results).
6. Transfer the single archive using Robocopy with /MT tuned to your CPU (start at /MT:8 or /MT:16 and measure).
7. Re‑enable antivirus and resume cloud sync.

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Flags and verification notes​

• The claim that Windows 11 version 24H2 supports multiple formats (ZIP, RAR, 7z, TAR) and that the built‑in tool cannot create encrypted archives is documented by Microsoft’s support pages; those statements are verifiable in Microsoft documentation.
• 7‑Zip’s compression algorithms (LZMA/LZMA2) and AES‑256 encryption are documented in 7‑Zip’s own materials and LZMA documentation. Compression ratios and benchmark numbers vary by dataset and hardware; user‑published times should be treated as indicative rather than absolute.
• Robocopy’s /MT behavior and recommended tuning are documented on Microsoft Learn; community testing supplements those guidelines and highlights that the best /MT value depends on CPU, disk type, and contention. Test settings before running production moves.
• Community benchmark snippets and forum reports referenced in this article are helpful for real‑world context but often lack standardized test conditions — use them as pragmatic guidance, not formal benchmarks.

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Conclusion​

Compressing files in Windows 11 is no longer a purely trivial task: the OS now handles more archive formats natively, but the real time savings when moving large data come from combining compression with tuned copy strategies and the right hardware. For everyday use, Windows’ built‑in ZIP is the fastest no‑install option. For smaller archives with strong compression and encryption, 7‑Zip is still the best choice. For bulk moves and migrations, compress locally and copy with Robocopy’s multithreaded options while tuning /MT for your hardware. Above all, balance speed with security: don’t leave antivirus off, and avoid web compressors for sensitive files.
Practical, repeatable workflows — compress locally, pick the right archive format, use SSDs and fast ports, then copy with a tuned tool — will save hours over repeated transfers and make “waiting on large file transfers” an occasional annoyance instead of daily work.

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Source: ZDNET Waiting on large file transfers? How to zip files in Windows 11 like a pro (and save time)

 

[ChatGPT]

Windows 11 now gives you more than a one‑click ZIP: when you need to move or share large files, the difference between a casual right‑click and a tuned, multi‑threaded workflow can be minutes — or hours — saved. This feature‑level guide explains the right way to zip large files on Windows 11, why it matters for real transfers, how to pick the right format and tool, and the practical trade‑offs every Windows power user should know before they press Compress.

Background / Overview​

Windows has supported ZIP archives through File Explorer for decades, but recent Windows 11 updates expanded what the built‑in UI can do and reduced friction for everyday compression tasks. The updated File Explorer offers a streamlined “Create Archive” experience from the right‑click menu and improved handling of several common formats, while still preserving the classic “Send to → Compressed (zipped) folder” flow for quick jobs.
That said, Windows’ native compressor deliberately does not create AES‑encrypted archives, and it provides limited control over advanced compression parameters like multi‑threading, solid compression, or fine‑grained splitting. For those capabilities, third‑party tools such as 7‑Zip, WinRAR, PeaZip, and Bandizip remain essential.
Practical file transfer speed is rarely about a single tool: hardware (SSD vs HDD), connection type (USB‑C/Thunderbolt vs USB‑2), file system (NTFS vs FAT32) and background activity (cloud sync, antivirus) all influence end‑to‑end throughput. The fastest, most reliable workflows pair the right archive format with a tuned copy method — for example, creating one archive locally and then transferring that single file with a parallel copy tool like Robocopy.

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Why zipping large files still matters​

• Fewer round trips: Bundling thousands of small files into a single archive reduces metadata churn and network overhead during copy operations.
• Smaller uploads/downloads: Modern compression algorithms (7z/LZMA2) often shrink large collections significantly — especially document collections and text data — which saves time and bandwidth.
• Simpler sharing: One file to upload, one link to send; recipients extract locally instead of downloading many separate items.
• Security (when used correctly): Encrypted archives prevent casual exposure when files are in transit, but native File Explorer lacks archive creation encryption — use a third‑party tool for that.

Overview: Built‑in ZIP vs third‑party tools​

• Built‑in ZIP (File Explorer)
• Pros: immediate, zero‑install compatibility; fastest for small, one‑off jobs; native Windows UX.
• Cons: limited compression tuning; cannot create AES‑encrypted archives; suboptimal for very large jobs or advanced splitting.
• 7‑Zip
• Pros: excellent compression (7z, LZMA2), AES‑256 encryption, multi‑threaded compression, reliable for backups and secure archives.
• Cons: recipients must have compatible tool (or use zip format instead of 7z).
• WinRAR
• Pros: fast compression, robust features (including recovery records), friendly GUI.
• Cons: proprietary for RAR creation; larger installs and licensing for full features.
• PeaZip / Bandizip
• Pros: solid security features (PeaZip supports AES‑256), modern UI choices, good format support.

When size and security matter, 7‑Zip (7z + LZMA2 + AES‑256) is usually the best balance between compression ratio and cost (free + open source). For maximum compatibility choose ZIP; for best size and encryption choose 7z; for speed‑first workflows consider WinRAR.

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How to zip and unzip (the built‑in way) — quick steps​

• Navigate to the file or folder in File Explorer.
• Select a single item or multiple files (Ctrl + click to pick specific items).
• Right‑click the selection → Show more options → Send to → Compressed (zipped) folder.
• Rename the resulting .zip file if desired.

To extract: right‑click the .zip → Extract All, choose destination and click Extract. You can also open the ZIP in File Explorer and drag individual files out — File Explorer will extract only those files to the destination. For program executables, extract the whole archive first to preserve supporting files.

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The pro workflow for large transfers — compress first, then copy​

When moving many small files or terabytes between drives or across a network, the best throughput often comes from creating one archive locally and then copying that archive as a single stream.
Why it helps:

• Reduces per‑file I/O and metadata operations.
• Converts many random reads into a sequential read/one write operation.
• Enables use of optimized copy tools that parallelize the transfer.

Recommended sequence:

• Create the archive locally (on the fastest available drive, ideally an SSD).
• Use 7‑Zip: Format = 7z (or zip for compatibility), Method = LZMA2, Level = Ultra or Maximum if size matters. Enable AES‑256 if encryption required.
• Pause cloud sync clients (OneDrive, Dropbox) and stop heavy background tasks to prevent extra I/O.
• Copy the archive using Robocopy with multi‑threading:
• Example: robocopy "C:\Temp" "D:\Backup" Archive.7z /Z /MT:16 /LOG:robocopy.log
• Start with /MT:8 or /MT:16 and tune based on CPU/disk performance; /MT accepts 1–128 threads. Monitor CPU and disk queue depth; reduce /MT on older HDDs to avoid thrashing.
• Extract on destination and verify integrity (test‑extract or checksums).

This compress‑then‑copy approach is especially effective when transferring across networks or between drives with radically different performance profiles.

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Step‑by‑step: Creating an efficient 7‑Zip archive for large data​

• Install 7‑Zip (free, open source).
• Select your files/folder in File Explorer → right‑click → Show more options → 7‑Zip → Add to archive.
• In the Add to archive dialog:
• Archive format: 7z for smallest size; zip for widest compatibility.
• Compression level: Ultra or Maximum for best size (longer CPU time); use Normal to balance speed.
• Compression method: LZMA2 for multi‑core scaling.
• Dictionary size and word size: increase for better ratio on large datasets (but watch RAM).
• Enable AES‑256 and set a strong password if confidentiality is required.
• If recipients have size limits, use “Split to volumes, bytes” to produce multi‑part archives (e.g., 100M or 2G chunks).

Important notes:

• Solid compression yields the best ratios on many small files but slows random extraction of individual files; consider it for backups, not for archives you’ll constantly read into.
• Adjust dictionary size based on available RAM; larger dictionaries improve compression but increase memory usage during both compress and extract.

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Splitting archives for attachment limits or partial transfers​

When you must respect email or file‑share limits, split the archive into labeled chunks. Both 7‑Zip and WinRAR support splitting in the archive dialog (e.g., create Archive.7z.001, Archive.7z.002). Recipients need only the first part to extract the full archive (so long as all parts are present). This is a robust, widely‑supported method for multi‑GB transfers.

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Performance tuning: Robocopy, /MT and practical tips​

• Robocopy’s /MT switch enables multi‑threaded copying of a single file or set of files. Typical starting values: /MT:8 or /MT:16. Increase until you see diminishing returns or CPU/disk saturation. Avoid extreme values on spinning HDDs to prevent increased seek penalty.
• Use /Z for restartable mode when network transfers are unstable; add /LOG to produce a copy log and /V for verbose output.
• Example recommended command:
• robocopy "C:\Source" "D:\Destination" Archive.7z /Z /MT:16 /LOG:robocopy.log
• For very large single‑file transfers over the network, consider streaming with rsync‑like tools or SMB tuning in enterprise scenarios; for most desktop users Robocopy is the fastest, built‑in option.

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Security and safety — scanning archives, encryption, and web tools​

• Scanning: Treat downloaded ZIP files like any other downloaded executable bundle. Right‑click the ZIP → Show more options → Scan with … (your installed antivirus) before extracting. This helps avoid accidentally unpacking malware hidden inside archives. If in doubt, extract to an isolated folder and then scan the extracted files.
• Encryption: Use AES‑256 in 7‑Zip or PeaZip for encrypted archives. Native File Explorer cannot create AES‑encrypted archives, so rely on third‑party tools when confidentiality is needed. Store passwords securely — encrypted archives are only as safe as the password management.
• Web compressors: Avoid uploading sensitive documents to online compressors unless you trust the service, their deletion policy, and they explicitly guarantee private handling. Local compression + encryption is safer for confidential material.

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Common pitfalls and how to avoid them​

• Don’t expect big gains compressing already compressed media (MP4, JPG, many PNGs). Compression is most effective for text, office documents, logs and other high‑entropy datasets.
• FAT32 cannot store files larger than 4 GB. If your archive or a split part exceeds that, use NTFS or exFAT to avoid errors.
• Avoid disabling antivirus unless you fully trust the files and re‑enable immediately. Real‑time scanning can slow copy operations but turning it off raises exposure to risk. If you absolutely must disable protection for a trusted large copy, perform the operation offline and re‑scan afterward.
• Don’t over‑thread on HDDs: if I/O waits spike, reduce Robocopy’s /MT value. Always test on a sample run before large production moves.

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Benchmarks and expectations (what to believe)​

Community benchmarks consistently show third‑party archivers (7‑Zip, PeaZip, WinRAR) outperform File Explorer in either speed or compressed size for large jobs. However, published timings vary by CPU, drive type, and dataset; treat single benchmark figures as indicative, not definitive. Always run a small test on your own hardware using the actual dataset before committing to a full migration.

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Practical checklists — match the method to your goal​

• Quick share (email or casual): Use built‑in ZIP (File Explorer). Fast, compatible, zero‑install.
• Small encrypted backup: Use 7‑Zip — Format = 7z, Method = LZMA2, Level = Ultra, Encryption = AES‑256. Verify archive integrity with test extract.
• Large drive‑to‑drive or network move (many small files): Create a single 7‑Zip archive locally, then copy with Robocopy /MT. Extract at destination.
• Cross‑platform share with non‑technical recipients: Use ZIP (built‑in or 7‑Zip export to ZIP) to maximize compatibility.
• When you need to split for upload limits: Use 7‑Zip or WinRAR split options to create .001/.002 or .7z.001 parts.

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Critical analysis — strengths, risks, and realistic expectations​

Strengths

• Convenience: Windows 11’s File Explorer now handles most everyday archive tasks without additional installs, lowering friction for casual users.
• Power options exist: Free third‑party tools like 7‑Zip offer advanced compression, AES‑256 encryption, and multi‑threaded performance for serious jobs.
• Pro workflows are straightforward: Compress‑then‑copy and Robocopy tuning deliver real, measurable time savings on large transfers.

Risks and limitations

• Native Encryption Gap: The built‑in compressor cannot create AES‑encrypted archives; sensitive data requires third‑party tools.
• Operational risk of speed hacks: Disabling antivirus or over‑threading copy operations can speed transfers but raise security and reliability risks. Mitigate with offline runs, testing, and re‑scans.
• Benchmark variability: Public benchmark numbers are useful but highly dependent on hardware and dataset — they should inform, not dictate, production choices.

Unverifiable or conditional claims

• Specific compression timings and percent savings are too variable to assert universally; treat any single lab number as conditional and verify locally. Community benchmarks provide orientation but not guarantees.

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Recommended tools and settings (quick reference)​

• 7‑Zip (free): Use 7z + LZMA2 + Ultra + AES‑256 for backups and secure archives. Split volumes if needed.
• WinRAR: Use when you need speed and recovery records; good for fast compression workflows.
• PeaZip / Bandizip: Good alternatives for encryption‑focused or UI‑preferences.
• Robocopy: Example command — robocopy "C:\Temp" "D:\Backup" Archive.7z /Z /MT:16 /LOG:robocopy.log. Tune /MT by testing; start at /MT:8 or /MT:16.

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Conclusion​

Zipping large files on Windows 11 is no longer a trivial, one‑size‑fits‑all operation. For occasional small jobs, the built‑in File Explorer ZIP remains the fastest path. For large transfers, backups, and secure archives, pairing a third‑party archiver like 7‑Zip with a tuned copy tool such as Robocopy yields the best results in speed, size and reliability. Test your settings, watch your hardware limits, avoid risky shortcuts unless fully controlled, and you’ll convert a tedious, error‑prone transfer into a fast, repeatable process that saves time, bandwidth and frustration.

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Source: ZDNET The right way to zip large files on Windows 11 PCs (and why it makes a big difference)