VRR is very much becoming more of a mainstream thing (Xbox added it; DP & HDMI both include in latest version; more monitors are tweaking their panel driver - a cheap value-add if they can adapt). It's definitely one more thing we should all consider when thinking about frame pacing (and test for how we actually do during horizontal scene pans etc).
An added detail to account for when constructing timing heuristic. https://www.gdcvault.com/play/1025407/Advanced-Graphics-Techniques-Tutorial-The
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