[topic fixed by mod] I'm releasing my product on Steam on Tuesday, July 26th. I've been using 5.3.5p2 which has been great. In preparation for release it was recommended that I switch to Unity 5.4 to get integrated Vive support. Just tried that, but unfortunately it is not usable because the graphics keeps spiking up to 36ms (dropping from 100+ fps to only 27 FPS). See pic below for detailed info on one spike. http://www.speedboatsim.com/wp-content/uploads/2016/07/ProfilerSpikesUnity5-4-0F1.png Is there anything that I can do about this? 5.3.5p2 does not do this at all, it's smooth everywhere. Do I have to choose between Vive support and acceptable graphics performance, or does anyone know a trick to get rid of this? I have changed nothing in my project, I simply updated Unity and now I have show stopping problems. If anyone knows of an earlier 5.4 version that doesn't have this problem, but does have integrated Vive support, I'd be grateful to learn about it. I've only got a few days until release so have some difficult decisions to make here.