Set piserver.exe to High priority
Since the crystal light tracking is calculated on your PC rather than by the headset, it will be affected by other processes. Open task manager, locate piserver.exe, and set priority to high.
Disable HAGS (Hardware Accelerated GPU Scheduling)
Windows may prioritize your game over the crystal's tracking. If you continue to have laggy tracking, disable HAGS in windows settings.
Disable CPU Core 0 for your game
Go to task manager (Details pane), right click the process for the game you are running, and click Set affinity. Uncheck CPU 0, and click OK.
This will reserve tge first core of the CPU for background processes (including pimax play) so that the game should not interfere with them.