After migrating from Horizon View 8.2 to Horizon View 8.4 we are seeing an issue where customers have a secondary monitor attached (to Teradici Zero Client) and rotated 90 degrees, when opening or moving windows on the secondary monitor it is very laggy and will fail to render all the pixels (see artifacts left over in the window and on the screen). When moving the window/application (like Word document) back to the primary monitor (portrait) the artifacts will follow by will disappear when the screen refreshes. We used to install the SVGA driver with the Horizon Agent, however, due to the vendor change we are now using the SVGA from VMware Tools. We have tried extracting the driver from older tools (not sure if there is a way to extract the driver from an old Agent installer) going all the way back to VMware Tools 11.0.5 and also tried using the VMware Tools SVGA driver from the latest VMware Tools 12.0.0 with no change in behavior. We have also tried rolling back our Zero Clients to the last firmware (21.03) in which the secondary monitor being rotated 90 degrees was working...nothing is resolving the issue. We will be opening a ticket with VMware, but wanted to see if others are having the same issue. We did see a post about applications performance issues with the VMware Tools SVGA driver, but as mentioned above we tried to manually update the Display adapter using various SVGA driver versions to no avail.