ledscape_wait() not always waiting

[cwshep]

I wrote a program which uses the ledscape interface directly for custom lighting and effects. I noticed some frame skipping and isolated the issue to the ledscape_wait() function returning almost immediately sometimes (despite the remaining loop time being the same). This often happens in bursts which causes a large number of frames to be skipped.

I'm not sure if it is related, but I also noticed my FPS dropped ~15% since upgrading to the latest code (vs. a version from around September).