This method will reduce your animation effects and some other things also but this will not provide any harm to your windows you can change the settings to default if you don't like it. But i think you gonna love this method, if you want to do work on your pc because it will really increase the performance of pc but if you want animations only then its your wish.
For better understanding you should have full concentration.
So lets began with the method-
1- Open 'My Computer' and right click in free space and click on 'properties'.
2- Now in the left panel go to 'Advance system settings'.
3- Now another window panel will be opened in-front of you,Now under 'Advance' heading you can see another heading of 'Performance' and now you have to click on 'settings' of performance.
4- Now another window panel will be opened and now under the 'Visual Effects' you have to click on 'Adjust for best performance'.
5- Click on 'Apply' and then click on 'OK'
Remember you can tick some of the features that you want in your windows. It depends on you.
Now you can see the animated effects of your window has been reduced but your pc speed has been increased.