One of the biggest causes of micro stutters in games are background programs and services using small or large amounts of CPU time on a sporadic basis.
A couple of programs which have caused me problems in the past have been Seticon.exe which caused microstutters in SOME games and Firefox which has caused both micro and large stutters.
The easiest way to check for problem programs is to alt-tab out of a game when you get stutters, bring up task manager (CTRL-SHIFT-ESC) click processes and click the CPU column TWICE to bring the highest CPU usage programs to the top. Taskmanager itself will use a small amount. Any program other than the game and System Idle Process using CPU time will be a potential cause of stutters.
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