Strange keyboard lag

[Mercutio879b]

Running 6 hosts with NVIDIA GRID cards, ~200 people between two non-persistent linked clone pools, one running the M10-0B profile, for users with a single monitor, another running M10-1B for users with dual monitors. I also have an older cluster without GRID that I've seen this on as well.

I've heard from a lot of users that they are suddenly seeing a lag between when they type on their keyboard, and when their words appear on the screen. The lag ranges from annoying to unusable. It doesn't seem to matter if they are on a PCoIP zero client, or on a Blast thin client, or on a thick client with the Horizon app installed.

Really strangely, the lag is worse in Chrome and Outlook. I initially was looking to the GPUs, as both of those applications are accelerated by GPUs, but the other cluster without GRID has the same issue. 

All the articles I've read state that it's high CPU ready times, but when I look at the charts in vSphere, ready time is under 0.25 per core, which should be perfectly fine. 

[Lieven]

I had exactly the same issue.

The client's endpoints are primarily thinclient laptops (Wyse 5470), thinclients (Wyse 5400) or home computers (could be anything). Due to the pandemic people are a lot working from home and use different endpoints and physical screen layouts: only the (thinclient) laptop screen, (thinclient) laptop screen with 1 external screen, (Thinclient) laptop screen with 2 external screens, thinclient with one or more external screens, ...).

Due to this Win10 cleartype was not always turned on and configured. After turning on and configuring cleartype the problem went away. NO more lag when typing and the fonts also appeared to be clearer.

I resolved the problem by adding the following regkeys through DEM (multiple DISPLAYs due to multiple possible screen layouts):

Windows Registry Editor Version 5.00

[HKEY_CURRENT_USER\Software\Immidio\Flex Profiles\ImportMarkers]
"Pre"=dword:86928386

[HKEY_CURRENT_USER\Control Panel\Desktop]
"FontSmoothing"="2"
"FontSmoothingGamma"=dword:000004b0

[HKEY_CURRENT_USER\SOFTWARE\Microsoft\Avalon.Graphics]

[HKEY_CURRENT_USER\SOFTWARE\Microsoft\Avalon.Graphics\DISPLAY1]
"PixelStructure"=dword:00000001
"GammaLevel"=dword:000007d0
"ClearTypeLevel"=dword:00000064
"EnhancedContrastLevel"=dword:00000032
"GrayscaleEnhancedContrastLevel"=dword:00000064
"TextContrastLevel"=dword:00000000

[HKEY_CURRENT_USER\SOFTWARE\Microsoft\Avalon.Graphics\DISPLAY2]
"PixelStructure"=dword:00000001
"GammaLevel"=dword:000007d0
"ClearTypeLevel"=dword:00000064
"EnhancedContrastLevel"=dword:00000032
"GrayscaleEnhancedContrastLevel"=dword:00000064
"TextContrastLevel"=dword:00000000

[HKEY_CURRENT_USER\SOFTWARE\Microsoft\Avalon.Graphics\DISPLAY3]
"PixelStructure"=dword:00000001
"GammaLevel"=dword:000007d0
"ClearTypeLevel"=dword:00000064
"EnhancedContrastLevel"=dword:00000032
"GrayscaleEnhancedContrastLevel"=dword:00000064
"TextContrastLevel"=dword:00000000

[HKEY_CURRENT_USER\Software\Microsoft\Avalon.Graphics\DISPLAY4]
"PixelStructure"=dword:00000001
"GammaLevel"=dword:00000898
"ClearTypeLevel"=dword:00000064
"EnhancedContrastLevel"=dword:00000190
"GrayscaleEnhancedContrastLevel"=dword:0000012c
"TextContrastLevel"=dword:00000002

[HKEY_CURRENT_USER\Software\Microsoft\Avalon.Graphics\DISPLAY5]
"PixelStructure"=dword:00000001
"GammaLevel"=dword:00000898
"ClearTypeLevel"=dword:00000064
"EnhancedContrastLevel"=dword:00000190
"GrayscaleEnhancedContrastLevel"=dword:0000012c
"TextContrastLevel"=dword:00000002

[HKEY_CURRENT_USER\Software\Microsoft\Avalon.Graphics\DISPLAY6]
"PixelStructure"=dword:00000001
"GammaLevel"=dword:00000898
"ClearTypeLevel"=dword:00000064
"EnhancedContrastLevel"=dword:00000190
"GrayscaleEnhancedContrastLevel"=dword:0000012c
"TextContrastLevel"=dword:00000002

[HKEY_CURRENT_USER\Software\Microsoft\Avalon.Graphics\DISPLAY7]
"PixelStructure"=dword:00000001
"GammaLevel"=dword:00000898
"ClearTypeLevel"=dword:00000064
"EnhancedContrastLevel"=dword:00000190
"GrayscaleEnhancedContrastLevel"=dword:0000012c
"TextContrastLevel"=dword:00000002

[HKEY_CURRENT_USER\Software\Microsoft\Avalon.Graphics\DISPLAY8]
"PixelStructure"=dword:00000001
"GammaLevel"=dword:00000898
"ClearTypeLevel"=dword:00000064
"EnhancedContrastLevel"=dword:00000190
"GrayscaleEnhancedContrastLevel"=dword:0000012c
"TextContrastLevel"=dword:00000002

[HKEY_CURRENT_USER\Software\Microsoft\Avalon.Graphics\DISPLAY9]
"PixelStructure"=dword:00000001
"GammaLevel"=dword:00000898
"ClearTypeLevel"=dword:00000064
"EnhancedContrastLevel"=dword:00000190
"GrayscaleEnhancedContrastLevel"=dword:0000012c
"TextContrastLevel"=dword:00000002

[HKEY_CURRENT_USER\Software\Microsoft\Avalon.Graphics\DISPLAY10]
"PixelStructure"=dword:00000001
"GammaLevel"=dword:00000898
"ClearTypeLevel"=dword:00000064
"EnhancedContrastLevel"=dword:00000190
"GrayscaleEnhancedContrastLevel"=dword:0000012c
"TextContrastLevel"=dword:00000002

[HKEY_CURRENT_USER\Software\Immidio\Flex Profiles\ImportMarkers]
"Post"=dword:464c582b

Regards,

Lieven