# GTX 1080 Displayport - Performance crush

**URL:** <https://forums.unrealengine.com/t/gtx-1080-displayport-performance-crush/370459>\
**Category:** Debugging, Optimization, & Profiling\
**Tags:** unreal-engine, Performance, UE4, question\
**Created:** [September 14, 2016, 7:37pm UTC](https://forums.unrealengine.com/t/gtx-1080-displayport-performance-crush/370459 "2016-09-14T19:37:53Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![anonymous\_user\_447cf1121](https://d3kjluh73b9h9o.cloudfront.net/original/4X/2/8/5/28502927f1d97ba1051b3b47ccfe17233bf41ef0.png) [@anonymous\_user\_447cf1121](https://forums.unrealengine.com/u/anonymous_user_447cf1121)\
**Post date:** [September 14, 2016, 7:37pm UTC](https://forums.unrealengine.com/t/gtx-1080-displayport-performance-crush/370459/1 "2016-09-14T19:37:53Z")

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Hey,  
I´m using the GTX 1080 with Displayport-\>Displayport to Monitor. The overall performance on the system is great, there is NO problem with anything.  
Except using the UE4.11/.12/.13 (not testet with earlier versions). UE4 runs nice using displayport as long as the viewport has the focus (120fps), but it lags as hell when the viewport loses the focus (4-6fps). Opening another window (Blueprint editor) crushes the performance even if the viewport has the focus. Minimizing the other window (Blueprint editor) will give the performance back for the viewport.

Using Displayport-\>HDMI (Adapter) with HDMI-HDMI (cable) works nice.  
Using HDMI-HDMI (cable) works nice.  
Using HDMI-HDMI, starting UE4, switching to Displayport-\>Displayport works nice.

**Only if Displayport-\>Displayport is used when UE4 is started we have this issue.**  
And yes, I tried other ports on the card, and the newest driver for 1080 is installed.

Displayport-\>Minidisplayport for HTC Vive is not working either. Not Epics fault, but may help with the issue.

attached.

Monitor is 4k, downscaling or changing resolution does not help either.

regards

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<div class="post-metadata">

**Author:** ![anonymous\_user\_447cf1121](https://d3kjluh73b9h9o.cloudfront.net/original/4X/2/8/5/28502927f1d97ba1051b3b47ccfe17233bf41ef0.png) [@anonymous\_user\_447cf1121](https://forums.unrealengine.com/u/anonymous_user_447cf1121)\
**Post date:** [September 14, 2016, 9:59pm UTC](https://forums.unrealengine.com/t/gtx-1080-displayport-performance-crush/370459/2 "2016-09-14T21:59:30Z")

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Well, found another thread

> **[My performance is awful on a new PC. Why?](https://forums.unrealengine.com/questions/327171/my-performance-is-awful-on-a-new-pc-why.html)**
>
> I built a new pc using a gtx 980 ti, an Intel i7-6700K, an Asus Maximus VIII Hero mobo, and a clean Windows 10 install. I have 32GB of DDR4 ram. Performance in UE4 is terrible, and UE4 is the only application I have tried that did not have stellar...

where it is told to shut down all taskbar programms. Did and it worked. Reduced it to “Nahimic from MSI”  
Already listet in the Software Conflicts Page:

> **[A new, community-hosted Unreal Engine Wiki](https://forums.unrealengine.com/t/a-new-community-hosted-unreal-engine-wiki/141494)**
>
> After over a year in maintenance mode, the official Unreal Engine Wiki is now permanently offline. These resources now live on a new community-run Unreal Engine Community Wiki — https://unrealcommunity.wiki/! You will be able to find content from...

Also seems to solve the problem with Displayport and HTC Vive not working.

Still very strange…