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SOLUTION for Low Framerate (FPS), Lag spikes under Windows 7

windows 7 multimedia class scheduler mmcs lag low fps fps

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#1 Daniel Cziranku

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Posted 23 June 2013 - 05:44 PM

Hello everyone !

If you use Windows 7, and you have a strong machine but still have some LAG, low FPS or unstable performance, here's a little trick you can try:
You'll have to turn off Multimedia Class Scheduler in both msconfig, and modify a key in the registry. This module causes fps drop-down, lag, and many more terrible things to our gaming performace. I turn this off on every build of Windows 7, every install.
so, let's get started

STEP #1
1. click on windows key / start menu
2. in the search field type and run: msconfig
3. click on the services tab, and search "multimedia class scheduler". uncheck the checkbox
4. if unchecked, click ok. when asked, DON'T restart your system. do STEP #2 before restarting !
( also, you can go through the "startup" tab's list, If you have something that isn't necessary to start with windows bootup, you can take them out easily here. this can save boot time and memory, too )

STEP #2
1. click on windows key / start menu
2. in the search field type and run: regedit
3. on the left side open the following path: HKEY_LOCAL_MACHINE > SYSTEM > CurrentControlSet > services > AudioSrv
4. click on AudioSrv, and on the right side of the window there will be a list, search and doubleclick "DependOnService"
5. after you opened the little window, DELETE the "MMCS" part. only that part, leave the other 2 alone.
6. if you deleted it, click OK and restart your computer.

ACHTUNG ! you need to go through both step 1 and step 2 in order to fully disable this little imp !
I gladly help anyone who needs it, just drop some letters and I'll reply.

Hope it helps a lot of you, have a nice day !


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#2 Mrjones_83

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Posted 23 June 2013 - 05:52 PM

Thanks for the Tip, I will try later tonight(after i watch SRO's :))

I hope it solves some of my issues.



#3 Daniel Cziranku

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Posted 23 June 2013 - 05:58 PM

You're welcome ! :) 


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#4 Dude74

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Posted 23 June 2013 - 06:18 PM

Me too, have done this but will test later. Let you know how it goes. thanks!


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#5 Daniel Cziranku

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Posted 23 June 2013 - 09:35 PM

Good luck with it ! You're welcome :)


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#6 Gábor Bakos

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Posted 24 June 2013 - 03:11 AM

In 1 step i shot out the MMSC, and after restart, there was no sound...

Then the second step is not afraid to do...



#7 NoFearc

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Posted 24 June 2013 - 03:46 AM

In 1 step i shot out the MMSC, and after restart, there was no sound...

Then the second step is not afraid to do...

 

You have to do both steps before rebooting!

When doing 1st step it asks to reboot, click reboot later and do the regedit one



#8 Daniel Cziranku

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Posted 24 June 2013 - 05:49 AM

In 1 step i shot out the MMSC, and after restart, there was no sound...

Then the second step is not afraid to do...

if you turn off both at the same time like NoFearc said, it won't shut down the audio service. but If so, then right click on the speaker icon after running through both steps and rebooted, and let windows re-enable the sound service. It won't turn MMCS back on, don't worry.
also, double check step2 / 5. ! If you delete more than just the "MMCS" part, you'll end up with a disabled audio service.

anyways, I had very bad experiences with ATi Radeon vgas. especially in racing simulator games. I had a HD6850 CrossFire (2 vgas linked together) setup in the early days of my simracing carreer, but switching to a single Nvidia GT430 (!!), made me much smoother performance.

oh and "Multimedia Class Scheduler" is translated to hungarian as "Multimédia Osztályütemező" :)
 


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#9 Coasterfreak46

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Posted 24 June 2013 - 08:37 AM

Thanks a lot, i can actually play with higher settings now :P



#10 Daniel Cziranku

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Posted 24 June 2013 - 09:28 AM

You're welcome Coaster ! 


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#11 Matrox

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Posted 24 June 2013 - 09:30 AM

Searching myself thru google did bring up some interesting discussions. Deleting the MMCSS part in registry caused stuttering audio. Apps who use MMCSS to priorise the correct amount of CPU time getting into trouble because Windows does now give all apps the same CPU time so Windows cant priorice correctly to have them all running smooth.

 

Can someone confirm sth of that?



#12 Daniel Cziranku

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Posted 24 June 2013 - 10:23 AM

Searching myself thru google did bring up some interesting discussions. Deleting the MMCSS part in registry caused stuttering audio. Apps who use MMCSS to priorise the correct amount of CPU time getting into trouble because Windows does now give all apps the same CPU time so Windows cant priorice correctly to have them all running smooth.

 

Can someone confirm sth of that?

Maybe you misunderstood something, windows CAN priorize it's software environment perfectly. it's the MMCS that has some trouble arranging priorities. If you don't turn it off, none of your games or 3d apps will reach the priority level needed. mmcs hates games.
As you can see, some guys here already gave it a try, and succeeded.

I run my own little computer shop here, last year's record was more than 1.800 installed windows 7s. I can confirm the total opposite of what you are worried about. :) Stuttering audio is more likely to be caused by faulty audio codecs, or drivers.
 


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#13 Matrox

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Posted 24 June 2013 - 10:54 AM

Well those where people who are professionally use audio editing/creating software. So its not like they dont know what they are talking about. And im used to do video editing + audio mixing so thats why i ask for issues with playing/editing media stuff



#14 Daniel Cziranku

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Posted 24 June 2013 - 11:56 AM

You can try it without weakening your system's integrity. If it doesn't work for you, just turn it back on with the same method. I have a Studio amongst my customers, I visit them regularly for maintenance. We disabled it there on the windows running machine, didn't experienced any kind of sound quality degradation or software compatibility problems.


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#15 ingange

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Posted 24 June 2013 - 03:00 PM

Will this work on vista too ?


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#16 Daniel Cziranku

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Posted 24 June 2013 - 03:09 PM

Will this work on vista too ?

Actually, mmcs appeared in vista first, taking serious part in the bad perfomance and the failure of the os.
It does work, but maybe for Vista you'll need a to go through a different method, the registry there builds up in a bit different way.  Also, If you have a chance, I strongly recommend switching to w7 or w8. or even back to XP :)


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#17 j_smith

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Posted 24 June 2013 - 03:28 PM

Nice find =D although for my particular issue it seemed to resolve itself with the latest patch... really weird, i only had sluggish fps in the Quick Race Race Monitor and nowhere else. however with the latest patch it went back to normal.



#18 Daniel Cziranku

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Posted 24 June 2013 - 04:28 PM

Thank you ! :) It's good to hear that, Mr Smith ! With your gaming rig, I'm not surprised you don't have client-sided performance issues :D


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#19 j_smith

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Posted 25 June 2013 - 07:00 PM

Thank you ! :) It's good to hear that, Mr Smith ! With your gaming rig, I'm not surprised you don't have client-sided performance issues :D

 

Its just a shame that the issue resolved itself before I could even test your solution on Windows 8 Pro =( it would have been good feedback for Windows 8 Users



#20 Daniel Cziranku

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Posted 26 June 2013 - 04:29 PM

8 is a little bit better optimized, but honesly I never had a full windows running. I always turned off whatever isn't necessary, and reserves memory or computing power to run in the background. Regardless to the hardware configuration, of course :)


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