Slowdown when downloading and using google "drive file stream"

Using version 12.16 pro with 2950x, 64gb and windows 10 pro.
If I'm using youtube-dl in a command window to batch download to a google drive file stream location, directory opus will experience significant slowdowns and hangs. All other applications continue to operate at normal speed, as do windows file explorer and other file tools.
If I stop the download, shut down dopus and then restart dopus - it works at normal speed again. Until I restart the download, after which dopus responsiveness rapidly degenerates again.

Interestingly, it's not something that I've always noticed happening, and I've had batch downloads running for long periods in the past without any apparent influence. I cannot pin point what might have changed.