I can also confirm that disabling 3D Acceleration in the Windows 10 VM greatly speeds up Citrix Receiver/Workspace, but this is a less than ideal solution as it impacts other Windows applications that benefit from or require 3D acceleration. I have a 3 GHz 10-core, 64 GB iMac Pro with 8 cores/16 GB RAM dedicated to the VM and experienced absolutely unusable performance with Citrix-based apps until I found this thread. Like the OP, this was not always the case and I can't quite pinpoint if this started occurring with macOS Mojave or with Fusion 11. I also experienced equally terrible Citrix app performance under Parallels (I installed a trial to see if this was occurring just with Fusion), so I'm thinking this may have to do with macOS Mojave or newer versions of Citrix Workspace.
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