Why does MMCSS make win7 change cards?

Under normal circumstances, our computer card is because there are too many things to open. But what we all know is that if you watch videos online or use Thunder to watch these movies while watching movies, it is very easy to cause the computer to become very card. And we have to tell you about MMCSS today, maybe you have never heard of it. But this really will definitely lead to a computer card.
1
Friends ask:
He didn't watch movies online, just listened to songs online, and the background didn't take any progress. Why do you still feel the card when you video with friends? Of course, this card is very slight. If it is a video card like watching a movie, I feel more normal. But even listening to the song video will be too abnormal. Is my computer desk rotten?
2
I have found a lot of methods for him,
I also asked him to show me the remote control for me, and finally to modify the registry.
3
Enter the registry: enter "ldedit" in the run.
Locate to: HKEY_LOCAL_MACHINESYSTEMCurrentControlSetServicesAudiosrv, find “DependOnService”, double-click it, and delete “MMCSS” in the window that appears. Figure:

4
MMCSS Introduction:
MMCSS service runs in the service host Svchost.exe, which can automatically raise the priority of audio and video playback to prevent other software from playing too much. The CPU time that the software should get. Whether it is online playback or local playback, multimedia playback requires a steady stream of media streams. When the playback requirements are not met, the system will “card”.
The above is about why MMCSS will make win7 change card? This solution can only be said to be one of them. If you also have this problem, this method is for reference only.