Hi everyone! 

I've been using Sony Vegas pro for years, but I never met this problem before. I never had any lag issues with it, until today, when I tried using the Anaglyphic red/cyan function. The preview is just awful, I can't do anything, I have like 5 fps. Tried to change some options, but nothing works. I'm a bit worried, how shall I fix it? I have i5 3.5Ghz, 8 GB ram, AMD R9 280x 3GB, so pc is not the problem.