Thanks for the info!
Re. “locally” and the rest: the whole DispVM is in RAM, including the MP4 file. So, that should not be a bottleneck.
I am reading the man page of qvm-prefs which says:
vcpus Accepted values: no of CPUs
Number of CPU (cores) available to VM. Some VM types (eg DispVM) will
not work properly with more than one CPU.
What does “properly” mean though?
I have just tried what you suggest with mplayer and the result in full screen is still the same.
Try
mpv --vo=x11 --profile=sw-fast
--vo=x11is the most important part.
Without --profile=sw-fast (only --vo=x11) mpv is still not so good.
However, with both options 1080p flies in full screen, even at x4 speed!
Thank you!