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What is mmcss.dll?

Part of Multimedia Class Scheduler Service by Microsoft

What is it?

The Multimedia Class Scheduler service (MMCSS) enables multimedia applications to ensure that their time-sensitive processing receives prioritized access to CPU resources. This service enables multimedia applications to utilize as much of the CPU as possible without denying CPU resources to lower-priority applications.

What if I disable Multimedia Class Scheduler Service?

If this service is stopped, individual tasks resort to their default priority.
Description of mmcss.dll from Microsoft
Multimedia Class Scheduler Service (MMCSS) is a Windows service that boosts the CPU as well as I/O priority of a thread. It allows an application to get prioritized access to CPU for time-sensitive processing (such as multimedia applications) as well as prioritized disc access to ensure that the process is not starved of data to process. The MMCSS service monitors the CPU load and dynamically adjusts priority so that the application can use as much CPU time as possible without denying CPU to lower priority applications. MMCSS uses heuristics to determine the relative priority required for the task the thread is performing and dynamically adjusts priority based on that.
(mmcss.dll is a system file that is installed with Windows)
Download Boost and enjoy your PC. Speed up Multimedia Class Scheduler Service and optimize your PC.

How is mmcss.dll loaded?

Hosted service - mmcss.dll is typically associtated with identifier name of cda9f1373805af88f6fa4f2064bba24d with and identifier of MMCSS. A Windows Hosted Service is a service that is implemented as dynamically-linked library (DLL) run under the (Service Host) SvcHost process.
Multimedia Class Scheduler Service is loaded by:

Community

What is the community is seeing?What is the community is doing?
About 0.5% of all Boost users have the mmcss.dll file.Of the 0.5% of mmcss.dll users, less than 1% have disabled it.
How resource intensive is the loaded module mmcss.dll?
Comparison based on the average resource utilization across all programs.
                              0.00238337% CPU198.6%
Average thread CPU utilization across all loaded modules is 0.00120%.
Typical file (disk image) location:
C:\Windows\System32\mmcss.dll

Are there other versions of Multimedia Class Scheduler Ser...?

What else is related?

What Windows OS versions does this run on?

Windows Developer Preview (6.2.8102.0)

About Microsoft Corporation

Microsoft, founded in 1975 by Bill Gates and Paul Allen, is a veteran software company, best known for its Microsoft Windows operating system and the Microsoft More...
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File details

File name: mmcss.dll
Publisher: Microsoft Corporation (verified)
Name: Multimedia Class Scheduler Service
Description: Microsoft® Windows® Operating System
Version: 6.2.8102.0 (winmain_win8m3.110823-1455)
Product version: 6.2.8102.0
Size: 48 KB
Original file name: mmcss.dll.mui
Windows file protection: Yes

Resource utilization

Total CPU: 0.0023833695%
User CPU: 0.0023833695%
CPU Cycle count /sec: 11,343
Module memory size: 72 KB

Hosted service details

Name: c78655bc80301d76ed4fef1c1ea40a7d
Command: MMCSS

Image hashes

MD5: 3424df4f7d81f560abbf85119e831d5f
SHA-1: b693566d3c056c94f89d7575e4851eb63b42c822

PE image details

CLR assembly: Yes
CLR NGENed: No
Subsystem: Windows Console
Langauge*: Microsoft Visual C# / Basic .NET
File packed: No
Import Table
advapi32.dll
api-ms-win-core-errorhandling-l1-1-0.dll
api-ms-win-core-errorhandling-l1-1-1.dll
api-ms-win-core-handle-l1-1-0.dll
api-ms-win-core-interlocked-l1-1-0.dll
api-ms-win-core-interlocked-l1-2-0.dll
api-ms-win-core-libraryloader-l1-1-0.dll
api-ms-win-core-libraryloader-l1-1-1.dll
api-ms-win-core-libraryloader-l1-2-0.dll
api-ms-win-core-misc-l1-1-0.dll
api-ms-win-core-processthreads-l1-1-0.dll
api-ms-win-core-processthreads-l1-1-1.dll
api-ms-win-core-processthreads-l1-1-2.dll
api-ms-win-core-profile-l1-1-0.dll
api-ms-win-core-synch-l1-1-1.dll
api-ms-win-core-synch-l1-2-0.dll
api-ms-win-core-sysinfo-l1-1-0.dll
api-ms-win-core-sysinfo-l1-1-1.dll
api-ms-win-core-sysinfo-l1-2-0.dll
api-ms-win-core-sysinfo-l1-2-1.dll
api-ms-win-eventing-classicprovider-l1-1-0.dll
api-ms-win-power-setting-l1-1-0.dll
api-ms-win-service-core-l1-1-0.dll
api-ms-win-service-core-l1-1-1.dll
avrt.dll
kernel32.dll
ntdll.dll
Export Table
servicemain
toservicemain
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