I tried to change screen resolution following the guide from wiki https://wiki.batocera.org/display_issues
After saving everything and rebooting machine, the res didn’t change. So I manually edited the file /usr/bin/batocera-resolution and changed variables MAXWIDTH and MAXHEIGHT. After modification the file needs to be saved additionally with ‘batocera-save-overlay’ command.
For me, lowering resolution to 720p (1280 × 720) dramatically improved performance.