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Regular frame drops [Vive] [many games]

Hello. I noticed today when profiling my Vive game that I was getting a single frame drop about once a second. Popping open the SteamVR Developer's Frame Timing charts I was able to see a pattern of regularly dropped frames. After doing some googling I came across this reddit post.

So I decided to check out some other UE4 games in my library to look for the pattern:

Trials: imgur link

Brookhaven Experiment Demo: imgur link

and my game: imgur link //spike at the end removing focus from the editor window

Is this a known issue?

Product Version: UE 4.13
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asked Oct 11 '16 at 05:28 AM in Rendering

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Dr_Jerm
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Hello Dr_Jerm,

The issue described above sounds like the result of Vsync. VSync stands for Vertical Synchronization. The basic idea is that synchronizes your FPS with your monitor's refresh rate. The purpose is to eliminate something called "tearing". This can cause frames to drop if the refresh rate of your monitor is not in sync with your fps. I hope that this information helps.

Make it a great day

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answered Oct 11 '16 at 08:32 PM

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Rudy Q ♦♦ STAFF
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avatar image Dr_Jerm Oct 15 '16 at 11:19 PM

So the Vive has a 90 Hz refresh rate and our project and others are easily running at 90fps. Should we be disabling VSync? I'm not sure what "the solution" is here...

avatar image Rudy Q ♦♦ STAFF Oct 17 '16 at 05:40 PM

I was providing information on what I thought the issue might be. However, I do have a request. Could you provide your Dxdiag so as to eliminate a few possibilities?

avatar image Dr_Jerm Oct 17 '16 at 06:45 PM

See attached. Thanks for your helplink text

dxdiag.txt (70.2 kB)
avatar image Rudy Q ♦♦ STAFF Oct 20 '16 at 08:06 PM

After further testing, I have been unable to reproduce this issue on our end. Could you provide an example project that is showing the issue that you mentioned above?

avatar image Dr_Jerm Oct 20 '16 at 08:27 PM

The easiest is running the projects I linked (Trials on Tatooine, Brookhaven Experiment, Raw Data [from the reddit post]). However if you wanted to look at my project, what is the suggested way to provide that?

avatar image Rudy Q ♦♦ STAFF Oct 20 '16 at 08:36 PM

You could provide a zipped down version via drop box or google drive. If you would like to provide it privately, you could do so be sending it in a private message to me on the forums.

avatar image Dr_Jerm Oct 20 '16 at 10:03 PM

Forum message sent.

avatar image Dr_Jerm Oct 30 '16 at 10:11 PM

Bump bump.

avatar image DeathUman Nov 07 '16 at 02:01 PM

Bump. I'm experiencing this issues across a lot of Unreal engine made game like RedOut. I think that something has to do with postprocess like temporal antialiasing or some screenspace effect that hasn't been disabled as it should and as a VR developer myself I'm very interested in what is causing this.

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