https://bugs.winehq.org/show_bug.cgi?id=44823
--- Comment #9 from Fab netbox253@free.fr --- (In reply to Vlad from comment #8)
a recent steam client update may have fixed this issue inadvertently?
"Linux:... Fixed an issue where the system might become temporarily unresponsive after exiting the client due to events accruing in the window system" (https://store.steampowered.com/news/42269/)
That part is for the Linux version of steam, not the Windows version we are talking about here.
I also noticed another wrong behavior related to this problem : when launching steam, after a few seconds whithout doing anything, the cpu usage is increasing as if it was entering into some infinite loop or something :
$ ps -p 5413 -o %cpu,%mem,cmd %CPU %MEM CMD 65.7 2.0 Steam.exe