Gfx.waitForPresent causing massive lag spikes in editor

Questions & Answers
1

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:

62385-waitforpresentspike.png
62385-waitforpresentspike.png973×444 91.4 KB

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

7

Turning off NVIDIA IN-GAME OVERLAY seemed to work for me. 105239-in-game-overlay.png

6

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.

105150-2017-11-06-17-40-24-geforce-experience.png

3

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.

4

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.

84898-gfx-1.png
84898-gfx-1.png517×789 119 KB

84899-gfx-2.png
84899-gfx-2.png465×682 49 KB

2

I have the same GPU and probably the same monitor as you and I had this exact issue. For me the fix was turning off G-SYNC in the NVIDIA control panel.

5

I don’t have Graphics Jobs (Experimental) checked, yet still see 63% Gfx.WaitForPresent. I also don’t even have a GPU. See attached. Any ideas?alt text

90488-gfxwaitforpresent.png
90488-gfxwaitforpresent.png1204×687 243 KB

8

I was able to fix mine by closing EVGA Precision XOC

9

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.