Performance Regression: Glutin on Linux

[mattico]

I noticed a performance regression with the new glutin code while running on Linux. I'm getting numbers that look like this:

New Windows: ~750 fps
New Linux: ~50 fps
Old Linux: ~250 fps

Same hardware for all of them. Windows 10 x64. Ubuntu 16.04 x64 with Nvidia 361.42 drivers.

Could be an issue with glutin maybe?

[eddyb]

That sounds like vsync + some input loop delays causing frame drops on top.
Although, I'm not sure, just speculating.