I'm mostly interested in Oculus's Rift software. I don't believe Virtual Desktop offers anything different than Oculus in-terms of performance and latency, but if anyone knows otherwise I'd like to hear it. I'm interested in tips for ALVR as well, but I don't believe it can reach ideal latencies until they implement sliced encoding.
One tip that others might find interesting is that Air Link defaults to H.264/AVC, but can be forced to HEVC. On NVIDIA, this seems more ideal and it's lower-latency. This command does that by adding a registry entry (you need to restart the Oculus service afterwards):
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reg add "HKEY_CURRENT_USER\SOFTWARE\Oculus\RemoteHeadset" /v "HEVC" /t REG_DWORD /d "1" /f
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reg delete "HKEY_CURRENT_USER\SOFTWARE\Oculus\RemoteHeadset" /v "HEVC" /f