Vsync causing fps drop and erratic fps. Any ideas are welcome.

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With VSync disabled my build runs at a stable 72 fps. But with VSync enabled the fps becomes totally erratic. Dropping as low as 36 fps but mostly fluctuating between 43 to 51 fps. Does VSync have a massive overhead or something?

Profiling a development build only shows WaitForTargetFPS and Gfx.WaitForPresent spikes. I've tried different nVidia driver versions and upgrading Unity to 2017.4.7f1 but neither of those helped. Running on Windows 10 version 1803.

Any ideas are welcome because I haven't got a clue as to how VSync could cause this. The problem is only present in builds. It's working fine in the editor :-)

Answer 1

Answer by BPhage · Jul 25, 2018 at 10:21 AM

when your computer renders the monitor pick the newest one on refresh. vsync however is a different story, it trys render when monitor is refreshed. which makes use of more cpu power and lower the video card power. using vsync makes fps drops. i suggest you to disable it. sorry for my bad english.not my language.

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BPhage · Jul 25, 2018 at 10:23 AM 0

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also, vsync sucks with unity.

BPhage · Jul 25, 2018 at 10:27 AM 0

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also unity sucks with vsync.

Liaram BPhage · Jul 25, 2018 at 10:37 AM 0

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Well getting rid of screen $$anonymous$$ring is quite nice but of cause if the player is looking for max fps then vsync is not the way to go.

Liaram · Jul 25, 2018 at 10:37 AM 0

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I get that vsync limits the fps to match the screen refresh rate so a fps drop is to be expected but the problem is that the fps becomes erratic jumping all over the place and quite a bit lower than the 60x refresh rate. That's the bit that has me stumped. I've never seen Vsync behave like that before especially since the build runs at a stable 72 fps without vsync. But thanks anyway.

Vsync causing fps drop and erratic fps. Any ideas are welcome.

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