Stuttering videos/gifs after Marshmallow update

So I installed the Marshmallow image on my Nexus and everything worked fine the first day. The next day I wanted to look some reddit gifs but it was stuttering a lot, first I thought it might be the gif itself but it happend to the next gif too and all the others. I also used 9gag to look if it was the reddit app but the stuttering was there aswell. I tried to wipe the cache but it didn't work and I can't choose another video player in the developer options. Does someone know how to fix it?

Thanks in advance.