# After VR Preview, Vive drops frame until Unreal is closed

**URL:** <https://forums.unrealengine.com/t/after-vr-preview-vive-drops-frame-until-unreal-is-closed/367457>\
**Category:** XR Development\
**Tags:** SteamVR, Vive, unreal-engine, bug-report, question\
**Created:** [August 17, 2016, 11:18pm UTC](https://forums.unrealengine.com/t/after-vr-preview-vive-drops-frame-until-unreal-is-closed/367457 "2016-08-17T23:18:06Z")\
**Posts on this page:** 4\
**Page:** 1

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**Author:** ![Charlesworth](https://d3kjluh73b9h9o.cloudfront.net/original/4X/2/8/5/28502927f1d97ba1051b3b47ccfe17233bf41ef0.png) [@Charlesworth](https://forums.unrealengine.com/u/Charlesworth)\
**Post date:** [August 17, 2016, 11:18pm UTC](https://forums.unrealengine.com/t/after-vr-preview-vive-drops-frame-until-unreal-is-closed/367457/1 "2016-08-17T23:18:06Z")

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Reproducible on 4.12 and 4.13 preview 2

When using the HTC Vive and SteamVR, after I close a VR Preview of my game, the Vive begins missing frames consistently and is labelled unresponsive. This is fixed immediately by closing Unreal Engine. I can reproduce the problem on both 4.12 and 4.13 preview 2 and it happens every time I use the VR preview.

I am also being affected by open issue UE-29224 ([Unreal Engine Issues and Bug Tracker (UE-29224)](https://issues.unrealengine.com/issue/UE-29224)), where the last frame of the VR preview remains after it is closed, but not as consistently so am, unsure if they are related.

Has anyone seen this and know a fix? Else this should be added to the issues list. Thanks very much for your help 🙂

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**Author:** ![anonymous\_user\_e3515d22](https://d3kjluh73b9h9o.cloudfront.net/original/4X/2/8/5/28502927f1d97ba1051b3b47ccfe17233bf41ef0.png) [@anonymous\_user\_e3515d22](https://forums.unrealengine.com/u/anonymous_user_e3515d22)\
**Post date:** [August 18, 2016, 12:27am UTC](https://forums.unrealengine.com/t/after-vr-preview-vive-drops-frame-until-unreal-is-closed/367457/2 "2016-08-18T00:27:24Z")

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I’ve had similar performance problems with Vive, too, but I’m not sure it’s the same thing. Here are 2 of them:

1. After editing, playing, editing, playing, etc. for a while, I’m no longer able to reach 90 FPS. If I exit the editor and launch it again, I’m back up to 90.

2. The biggest problem is where all of a sudden my frame rate will take a major dive. The game will stutter severely while the Vive display flickers horribly. Sometimes, if I just wait, it’ll suddenly fix itself. Other times, I’ll have to exit the editor and relaunch.

Do these sound in any way similar to what you’re seeing?

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**Author:** ![rranon](https://d3kjluh73b9h9o.cloudfront.net/original/4X/2/8/5/28502927f1d97ba1051b3b47ccfe17233bf41ef0.png) [@rranon](https://forums.unrealengine.com/u/rranon)\
**Post date:** [September 30, 2016, 11:12am UTC](https://forums.unrealengine.com/t/after-vr-preview-vive-drops-frame-until-unreal-is-closed/367457/3 "2016-09-30T11:12:51Z")

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I have exactly the same problem on UE 4.12.5. Any update / info from Epic?

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**Author:** ![anonymous\_user\_e3515d22](https://d3kjluh73b9h9o.cloudfront.net/original/4X/2/8/5/28502927f1d97ba1051b3b47ccfe17233bf41ef0.png) [@anonymous\_user\_e3515d22](https://forums.unrealengine.com/u/anonymous_user_e3515d22)\
**Post date:** [September 30, 2016, 7:19pm UTC](https://forums.unrealengine.com/t/after-vr-preview-vive-drops-frame-until-unreal-is-closed/367457/4 "2016-09-30T19:19:41Z")

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I haven’t heard from Epic on this. The problem still happens, though I haven’t tried 4.13 yet.