File Cache - Disable Rescan cache when new definitions load

Have been having problems with SEP 12.1.4 clients slow for a few mins in workday.

i checked event viewer and see that this happens around the time that new virus defs are loaded

under quarantine have "do nothing" selected when new defs arrive

have upgraded SEPM and SEP to 12.1.5, still the same problem

have found another setting for "File Cache" when new defs arrive

is it ok to disable file cache rescan?

thanks