What is the Multimedia Class Scheduler (MMCSS) service?

An explanation of the Multimedia Class Scheduler (MMCSS) service in Windows 7.

What does the Multimedia Class Scheduler (MMCSS) service do?

The Multimedia Class Scheduler (MMCSS) gives higher CPU priority to certain applications. Windows Media Player uses this to prioritize itself over other programs when it’s playing video so that the video plays smoothly.

Multimedia Class Scheduler (MMCSS) service details

  • Service name: MMCSS
  • Description: Enables relative prioritization of work based on system-wide task priorities. This is intended mainly for multimedia applications. If this service is stopped, individual tasks resort to their default priority.
  • Path to executable: C:\windows\system32\svchost.exe -k netsvcs
  • Startup type: Automatic

Does my computer need the Multimedia Class Scheduler (MMCSS) service?

Your computer doesn’t need the MMCSS service to run.

Should I disable the Multimedia Class Scheduler (MMCSS) service?

First off, I have to say that it’s best to leave service optimization up to Microsoft. With that said; I would leave the MMCSS service alone. Multimedia programs like Windows Media Player or iTunes might not perform well if this service is disabled.

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