I’ve had similar performance problems with Vive, too, but I’m not sure it’s the same thing. Here are 2 of them:
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After editing, playing, editing, playing, etc. for a while, I’m no longer able to reach 90 FPS. If I exit the editor and launch it again, I’m back up to 90.
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The biggest problem is where all of a sudden my frame rate will take a major dive. The game will stutter severely while the Vive display flickers horribly. Sometimes, if I just wait, it’ll suddenly fix itself. Other times, I’ll have to exit the editor and relaunch.
Do these sound in any way similar to what you’re seeing?