I always used to delete overseer.exe and its related scheduled task after every update of Avast. Then, a few months ago, I let it be to see if it would behave. It went well for a while, but then...
Today, I noticed that my PC was very slow when starting programs. Turns out overseer.exe was maxing out a core permanently, and massively slowing down every other process trying to run.
Even with almost all programs closed, overseer.exe kept hogging a core at max load. An otherwise idle PC, and overseer.exe just going full send. Great.
The fix was the same one that I used to employ previously: completely remove overseer.exe. Instantly performance was restored.
Maybe in a year I'll give it another try. Until then overseer.exe gets rooted out first thing after an update.