https://bugs.winehq.org/show_bug.cgi?id=55026
--- Comment #8 from Fabian Maurer dark.shadow4@web.de --- Created attachment 74631 --> https://bugs.winehq.org/attachment.cgi?id=74631 Make automatic registry save interval configurable
For me it seems to only save if there's changes. I tested by opening regedit and then the system.reg file in notepadqq. I only got notified that the file changed when I changed values in regedit. Of course, it could be that some program you're running makes constant minor registry changes and wineserver needs to flush all these.
Anyways, I added the functionality you want in a patch. Would you mind testing if that works for you?
It's a DWORD called "RegistrySaveInterval" under "HKEY_LOCAL_MACHINE\Software\Wine\Server", representing the number of seconds between automatic saves. 0 means never - flushing at wineserver shutdown is unaffected. This setting does require a wineserver restart though.