Gfx.waitForPresent causing massive lag spikes in editor

Question

Something is causing the editor to get unusably low framerates in the editor. Using the profiler, I can see that Gfx.waitForPresent is spinning for around 100ms at each lag spike. Now, I've been around Unity for a while now, and I know that Gfx.waitForPresent is VSync, but no matter what the target framerate is, it should never have to wait 100ms between frames. Here's a screenshot of the profiler on an empty scene in a new project when I just try to move the editor camera around: alt text

This is a brand new system, here are the specs if that might help shed some light: - i7-6700k - GTX 980Ti - 16GB RAM - NvMe PCIe SSD - G-Sync monitor (2560x1440@165Hz)

I have already tried changing pretty much every VSync/G-Sync related setting I could find. Any ideas would be appreciated

Answer 1

Answer by pophead2 · Nov 08, 2017 at 02:35 PM

Turning off NVIDIA IN-GAME OVERLAY seemed to work for me. alt text

in-game-overlay.png (32.0 kB)

Add comment · Show 6 · Share

baabeuf · Nov 21, 2017 at 10:18 AM 0

Share

Worked for me too.

marcmong · Dec 23, 2017 at 03:18 PM 0

Share

This fixed it for me! Thanks!

Skegon · Feb 24, 2018 at 10:27 AM 0

Share

Awesome! Thank you! I have had this problem for so long, and couldn't figure out what caused it.

GameDev_Chuck · Mar 21, 2018 at 12:17 AM 0

Share

I was afraid this might be the issue. It was great for screen caps and working fine up until last night when I made the mistake of installing updates. Now my fps is absolutely tanked unless this is disabled... Woe is me.

mahdi_jeddi · Mar 28, 2018 at 04:23 PM 0

Share

100 times this! Thanks!

Show more comments

Answer 2

Answer by DarnVisages · Nov 07, 2017 at 12:42 AM

I found a solution for my computer. If you have a laptop with an NVIDIA GPU, check if the problem only happens when you have the AC unplugged. If so, open Geforce Experience and go to Settings > Games. There's a setting called "Battery Boost", turn that off completely or move the FPS setting within it up to 60 FPS.

alt text

2017-11-06-17-40-24-geforce-experience.png (25.9 kB)

Add comment · Show 1 · Share

JeromeJ · Mar 06, 2018 at 08:23 PM 0

Share

Fixed it for me! Huge bottleneck while being unplugged and nothing else could fix it.

Answer 3

Answer by NinjaISV · Dec 29, 2016 at 06:34 AM

I believe I have found the solution; it worked on my project at least! This "Gfx.WaitForPresent" was being caused by a tiny checkbox in the "Player" settings. Uncheck "Graphics Jobs (Experimental)" and you should see that "Gfx.WaitForPresent" has either been completely removed or at least greatly reduced.

alt text

gfx-1.png (121.8 kB)

gfx-2.png (50.2 kB)

Add comment · Show 1 · Share

siddharth3322 · May 10, 2019 at 02:02 PM 0

Share

This is by default co$$anonymous$$g unchecked so this is not a point.

Answer 4

Answer by qulol · Dec 29, 2016 at 06:16 AM

Try Edit --> Project Settings --> Quality and V Sync Count to Don't Sync.

Gfx.waitForPresent is like the CPU is waiting till the rendering process is finished.

If the problem still exist u should check ur renderprocess in the profiler wich takes much time.

Add comment · Share

Answer 5

Answer by johnsolo · Apr 04, 2019 at 08:26 PM

If you are on MacOS disabling Metal might help with this. My Mac mini with integrated graphics was chugging along on simple scenes between 45-60fps. After disabling Metal my FPS is in the hundreds!

Project settings > Player > Other settings > Rendering > Auto Graphics API For Mac (uncheck) Then drag OpenGLCore above Metal in the list.

Add comment · Show 1 · Share

andywatts · Apr 09, 2020 at 12:07 PM 0

Share

Thank John Solo!

Gfx.waitForPresent causing massive lag spikes in editor

7 Replies

Your answer

Follow this Question

Related Questions