LFC is still broken in this version: Wildly fluctuating refresh rate and flicker at low framerates. @array mentioned the same problem below in 570 release feedback & discussion - #78 by array, and I’m also still seeing the same thing, which has been happening since at least version 550.
Also, the desktop is really stuttery unless I use NVreg_EnableGpuFirmware=0, and firefox and thunderbird crashes when closing a window when running under XWayland. I found some people mentioning similar problems with Firefox in version 560 in 560 release feedback & discussion - #23 by multi_monitor_vrr and 560 release feedback & discussion - #28 by steckums. Seems like a segfault somewhere in /lib64/libEGL_nvidia.so.0, deep inside mozilla::gl::GLLibraryEGL::fSwapInterval.