Have you tried assigning the first three cores to vpx as described in Chapter 17, "Performance Optimization" in mjr's Pinball Build Guide? That worked in both of my cabs, with and without Frame Pacing, but I left Frame Pacing enabled anyway.
Both cab's have 5600X CPU's, one with an RTX 2070 and a Samsung 4K 60Hz display, the other with an RTX 3070, and a 120Hz 4k LG OLED playfield. No stuttering or flipper lag on either system - none.
While it would seem that reducing the number of cores assigned to VPX is counter intuative, in this case it makes them higher priority than non pinball interrupts - so the software responds immediately to VPX interrupts, ahead of all the other threads.
Otherwise it responds to interrupts in a round robin manner, making VPX wait it's turn, which can result in response lags.
Hope this helps.



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