Demon’s Souls on KytyPS5 for Windows Hits 34 FPS, but 8 FPS Lows Undercut 60 FPS Claims

What the October 5 clip shows​

The performance overlay in the footage reads about 31 FPS at the captured moment and a recorded average of 34 FPS. It also lists a 1% low of just 8 FPS. TweakTown describes frame rates that dip considerably, with hitches and some tearing. The overlay also reports about 14.46 GB of GPU memory and 28.30 GB of system RAM in use.

Those figures are readings from one video, not controlled benchmarks. They show a rendered gameplay scene at roughly 30 FPS. They do not show a stable 40 FPS, and they are nowhere near a stable 60.

The TweakTown headline and subheading are looser than its own numbers. The headline says the game is "closing in" on 60 FPS, and the subheading says around 40 FPS. The article body describes an average in the mid-30s with severe lows. The body is the better guide.

Average FPS isn't the same as playable​

An average in the low-to-mid 30s can hide a rough experience. A 1% low of 8 FPS means that during the worst moments the game slows to a crawl. Hitching and tearing make that worse. Anyone who has played a game on an overloaded PC will recognize the feel: the number looks fine until the camera moves.

The memory readings are also specific to this one test. Roughly 14.5 GB of video memory and 28 GB of system RAM do not amount to minimum system requirements. They show only that the demanding game was using a lot of memory in this scene.

The trajectory over recent weeks​

Other outlets give a picture of how quickly KytyPS5 has moved:

• Digital Citizen reported that KyTyPS5 was running Demon's Souls Remake at between 10 and 18 FPS after previously managing only around 2 FPS.
• DSOGaming reported that the latest build could run the game at 30 FPS, though with numerous drops below that target.
• Duck-IT Tech News said that the 30 FPS result came on a system with a Ryzen 9 7900X3D and a GeForce RTX 4080. It added that the build was not part of the normal public release.
• DSOGaming later covered a video showing 40-50 FPS on an Intel Core i9 14900K with an NVIDIA RTX 5090. It noted that this was a fork or local build not yet available on GitHub. It also cautioned that the rest of the game may not run as smoothly as the video suggests.

The 40–50 FPS result and the October 5 result come from different clips on different hardware. The RTX 5090 and i9-14900K machine is a much more powerful system than the RTX 4080 and Ryzen 7 9800X3D. The builds, scenes and settings may also differ, so the two results shouldn't be treated as a single trend line. Tom's Hardware, which covered the 40–50 FPS clip, noted that it was short and showed only a few sections of the game.

GamesRadar also points out that this level of performance is still below the 60 FPS of the PS5 game's performance mode. It adds a caution that neither emulator is yet a truly viable way to play PS5 games. That is paraphrased from its report, and the exact quote is not reproduced here.

Why the hitching may persist​

Tom's Hardware offers general context on why emulators stutter, and it is not a diagnosis of this clip. It says the main obstacles are not emulating the CPU or GPU but writing compatibility layers for the console's operating system and drivers. That includes converting the console's native graphics shaders to Vulkan's SPIR-V language. Shader compilation is a classic source of stutter because it is hard to predict which shaders a game will need before they are used.

The KytyPS5 repository supports the Vulkan side of this. Its developer notes say the PS5 graphics architecture is based on AMD RDNA 2 and describe a Vulkan 1.3 renderer. Nothing in the evidence confirms that shader compilation caused the 8 FPS lows or the tearing in the October 5 video. Treat that as a plausible area of work, not a finding.

What this means for Windows users​

KytyPS5 is a free, open-source project. Its GitHub page describes it as written in C++ for Windows and Linux, with experimental macOS support. Windows is the primary target and gets the most testing. The project says it can boot 2D games and a selection of 3D games, and that compatibility, stability and performance vary between builds.

If you want to experiment, the practical points are:

• Hardware requirement: One report says you need a Windows or Linux PC with a Vulkan 1.3-compatible GPU. That is consistent with the project's stated renderer target.
• Legal use: The project says it does not distribute games or system software. You must use only game files you obtained legally.
• Builds vary: The footage appears to come from local or development builds. Don't assume the public release matches what you see in a video.
• Reporting problems: The project asks testers to include the version they tested and the complete log file when filing a bug report.
• Expectations: A video demo is not a playthrough. The evidence doesn't confirm that saves, audio or long sessions work.

Reading the 60 FPS claim​

No measured trend, developer commitment or controlled test supports a 60 FPS date. DSOGaming speculated about reaching 60 FPS by the end of 2026 if development continues at this pace. That is one commentator's guess. Progress from a handful of clips can stall, and the hardest remaining problems, such as frame pacing and shader stutter, tend to resist quick fixes. TweakTown's closing line that developers are "closing in" is an optimistic reading of an average that is still around half of 60.

That said, the pace is striking. A demanding first-party PS5 title went from barely booting to rendering gameplay in weeks. Whether that holds up outside curated clips is the open question.

Bottom line​

• The October 5 clip shows Demon's Souls at roughly 31 FPS at one moment and a 34 FPS average on an RTX 4080 and Ryzen 7 9800X3D.
• The 8 FPS 1% low, hitching and tearing mean it is not a smooth experience.
• Higher 40–50 FPS results come from a different, more powerful RTX 5090 and i9-14900K setup.
• 60 FPS is a stated hope, not something any of these clips demonstrate.
• KytyPS5 is a Windows-first project in active development, so results will keep changing between builds.