See:
https://www.techtimes.com/articles/2...rate-drops.htm
"Windows 10 Gaming Hampered By Bug

The issue included stuttering and frame rate drops in games. It also caused outright crashes. All of these issues were linked to the KB5001330 update, and the previous KB5000842 preview update, with even an Nvidia forum admin coming forward to recommend that people should try removing these updates to cure the bug."