Variable refresh rate is now possible in a multi-monitor setup under Wayland. However, it currently is only used for the window in focus (at least on Nvidia, I haven’t checked on other vendors), which also means it only works for one window at a time. It would be nice if VRR also worked for windows not currently in focus (provided the given window is in fullscreen with no window in front of it on the same screen), including having multiple applications running in fullscreen on separate screens at the same time, with each monitor separately synced to whatever application is on it.