Wow, you followed the bot's advice to a good conclusion. You are incredibly patient. I found the bot's answers completely overwhelming and would have turned off some messages ago.
If you suspect you might still be infected, you may way to run 3rd-party scanners like ESET Online Scanner, Emsisoft Emergency Kit, etc. Otherwise, you may want to seek help with malware removal in specialized forums.
The 25H2 update is supposed to be just an enablement package, meaning the download is minimal and the update is more or less instantaneous. Some people have done this since last month. The message you see now is probably the real update for this month.
I would suggest you:
Update for this...
I think your answers are steeped with technical jargons that don't specifically address the question. The only relevant answers seem to be related to caching/compression algorithms that cannot predict random encrypted data. The rest seem to be gobbledygook, but I'll leave with that question...
The encryption/decryption is done within the CPU for USB flash drive without native encryption. Why would the flash controller and bus be the limiting factors? Wouldn't those be limiting factors even without Bitlocker encryption/decryption?
Can you be more specific about what is hardware encryption support?
Do you know, in percentage, the performance impact of Bitlocker on the drive througput?