i just updated system and is on 5.10.11

If anyone uses bgm with livewire setup it seem update removes the python-pygame which is needed. (tested on another base and was ok)
So you need to reinstall manually
or use the install script to remove and re install BGM and missing package

If you use @mitu tweak in cmdline.txt
snd-bcm2835.enable_compat_alsa=1
you can set audio so mixer can work to SYSDEFAULT or HW with PCM
if you dont use this and have new default setup
you use SYSDEFAULT or HW and HDMI

NOTE
If you touched the retropie config section audio settings, go back and set to reset to default

@TheFloW said in Randomly slow EmulationStation menus on RPi 4:

I was referring to how to get to HDMI boost and TV mode

HDMI boot configuration is not available for the Pi4, as for the mode selection, you can just use raspi-config and select 1080p as default video mode.