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Well, not long after someone reported the issue to Valve from my benchmarks, the performance penalty of using Vulkan with the Steam Overlay seems to be mostly fixed.

Beta changelog:
QuoteGeneral
- Fixed game install failing with “Content still encrypted”

VR
- Fixed VR keyboard over-aggressively popping up on library page

Steam Overlay
- Improved rendering performance with Vulkan applications
- Improved stability of Big Picture overlay with Direct3D 10 applications and above


Nice to see my benchmark prompted Valve to push this issue a little quicker. See their release announcement here. Article taken from GamingOnLinux.com.
Tags: Beta, Steam, Vulkan
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25 comments
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wojtek88 15 Apr, 2016
Quotethe performance penalty of using Vulkan with the Steam Overlay seems to be mostly fixed.
Will you redo The Talos of Principle tests for Vulkan with Steam overlay turned on?
Pecisk 15 Apr, 2016
Well, that was impressively fast.
Liam Dawe 15 Apr, 2016
Quoting: wojtek88
Quotethe performance penalty of using Vulkan with the Steam Overlay seems to be mostly fixed.
Will you redo The Talos of Principle tests for Vulkan with Steam overlay turned on?

Probably :)
ziabice 15 Apr, 2016
Will they ever fix the Steam Runtime to run with open source graphics drivers?
melkemind 15 Apr, 2016
When you run the Vulkan drivers, do they function well/normally with the desktop and other games, or do you have to switch back to other drivers when you're not testing Vulkan?
Keyrock 15 Apr, 2016
I'm glad they addressed this. The overlay is a big feature of Steam. Having said feature come with a 20% FPS penalty would knock much of the shine off the shiny new Vulkan API when using Steam.
Mountain Man 15 Apr, 2016
Now we just need more games supporting Vulcan. :D
Mountain Man 15 Apr, 2016
Quoting: ziabiceWill they ever fix the Steam Runtime to run with open source graphics drivers?
Alternatively, will the open source drivers ever be fixed to run with Steam Runtime?
minj 15 Apr, 2016
Quoting: Mountain ManNow we just need more games supporting Vulcan. :D
this Vulkan typo is annoying, please stop
Armand Raynal 15 Apr, 2016
Yeah, we're not in a startrek special episode here :><:
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