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[Trevor Parker]

Great topic. The single biggest edge case people miss is the VRR range mismatch — just because a monitor advertises “1-165Hz FreeSync” doesn’t mean it hits that full span with adaptive sync enabled. On many panels the actual G-Sync-compatible window is narrower (often something like 48-144Hz) and drops below the LFC threshold below ~48fps. Low Frame Rate Compensation kicks in to multiply refresh rates so your 30fps still maps to a stable 60Hz/90Hz, but once the game exceeds the monitor’s native max refresh while still in adaptive-sync mode, you can get frame piling-up and stuttering because the panel can’t actually render those frames. The fix is usually capping frames a few below the monitor’s native max or setting a hard ceiling in your GPU control panel so it never asks the panel to do the impossible.

For debugging, isolate the variable methodically. Start with the cable and port — a certified Ultra High Speed HDMI cable is mandatory for 2.1 VRR at 4K/120, and a marginal cable will silently drop you back to fixed refresh with black frames rather than throwing an error. Verify in NVIDIA/AMD telemetry (RTSS frametime graph or

"git commit -m "fix: resolve microstutter in shader cache pre-warming"

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