Technology
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I can vouch for the performance hit - I used to have a Surfacebook 2 and with Bitlocker enabled the machine was unusable. I'd say the performance hit was significantly higher than 45%. Turning it off at least allowed me to have a functioning laptop.
The same hardware then ran Linux with full disk encryption enabled and performance was night and day.
It has been many years since I've used an OS without full disk encryption, so I can't really compare, but I have a Windows Partition for some proprietary software that doesn't like Wine on my PC, and it is really smooth. Might be because it's on a NVME SSD, though.
65% of 5 GBps is still faster than most people need