# Unacceptably long alt+tab on Windows 10

**URL:** https://discourse.glfw.org/t/unacceptably-long-alt-tab-on-windows-10/1120
**Category:** support
**Created:** [May 17, 2018, 10:32pm UTC](https://discourse.glfw.org/t/unacceptably-long-alt-tab-on-windows-10/1120 "2018-05-17T22:32:40Z")
**Posts on this page:** 4
**Page:** 1

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### Author: ![ghuser404](https://yyz1.discourse-cdn.com/flex035/user_avatar/discourse.glfw.org/ghuser404/32/140_2.png) [@ghuser404](https://discourse.glfw.org/u/ghuser404)
#### Post date: [May 17, 2018, 10:32pm UTC](https://discourse.glfw.org/t/unacceptably-long-alt-tab-on-windows-10/1120/1 "2018-05-17T22:32:40Z")

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I have a borderless window with the size of my monitor resolution. With the latest Windows 10 update after pressing Win key (or alt+tab), it takes about 5 seconds for task bar to pop up.

Is anyone experiencing similar behaviour?

P.S. My code used to work without this kind of delay.

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### Author: ![dougbinks](https://yyz1.discourse-cdn.com/flex035/user_avatar/discourse.glfw.org/dougbinks/32/39_2.png) [@dougbinks](https://discourse.glfw.org/u/dougbinks)
#### Post date: [May 18, 2018, 9:18am UTC](https://discourse.glfw.org/t/unacceptably-long-alt-tab-on-windows-10/1120/2 "2018-05-18T09:18:30Z")

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I have also seen longer fullscreen switching and ALT+TAB switching from fullscreen since the Win 10 update. I haven’t had a chance to profile why this is yet.

In case it’s GPU driver related, I have an AMD R9 Nano and am on Radeon Software Version 17.7. My copy of glfw is built from master on 7 Feb 2018.

If I get a chance to look into this I’ll report back here.

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### Author: ![dougbinks](https://yyz1.discourse-cdn.com/flex035/user_avatar/discourse.glfw.org/dougbinks/32/39_2.png) [@dougbinks](https://discourse.glfw.org/u/dougbinks)
#### Post date: [May 18, 2018, 9:36am UTC](https://discourse.glfw.org/t/unacceptably-long-alt-tab-on-windows-10/1120/3 "2018-05-18T09:36:37Z")

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I’ve tracked the problem down via a search online and confirmed it’s a new Windows 10 feature called focus assist. See here for fix:

> **[How to Fix Slow Alt + Tab When Playing Games on Windows 10 April 2018 Update](https://news.softpedia.com/news/how-to-fix-slow-alt-plus-tab-when-playing-games-on-windows-10-april-2018-update-520927.shtml)**
>
> New OS feature seems to cause more harm than good

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### Author: ![ghuser404](https://yyz1.discourse-cdn.com/flex035/user_avatar/discourse.glfw.org/ghuser404/32/140_2.png) [@ghuser404](https://discourse.glfw.org/u/ghuser404)
#### Post date: [May 18, 2018, 12:07pm UTC](https://discourse.glfw.org/t/unacceptably-long-alt-tab-on-windows-10/1120/4 "2018-05-18T12:07:58Z")

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Thanks a lot for your research. I think I didn’t notice slow downs with apps using DirectX, but I’ll have to check. Hopefully this gets fixed soon.