If you're using mir_proving_server (or in general any server with the built-in MultiThreadedCompositor) then you may find the answer in: --compositor-report=log (or env MIR_SERVER_COMPOSITOR_REPORT=log)
That will show the frame rate of the individual (per-display) compositors.
If you're using mir_proving_server (or in general any server with the built-in MultiThreadedCo mpositor) then you may find the answer in: --compositor- report= log (or env MIR_SERVER_ COMPOSITOR_ REPORT= log)
That will show the frame rate of the individual (per-display) compositors.