Firmware is aproximately 78mb while vendor is near 500mb.I'm currently running this ROM without issues, but I have a doubt about firmwares. Time ago I installed the full vendor/firmware for version 12.0.7 that is global, the file is more than 500 mb in size. but the android R(11) 12.0.7, is an update for the installed firmware, but it is from EU, not global. My question is if it could bring some issues further.
So, it makes sense the size you mentioned.
Vendor partition contains miui bloatware, so nothing to worry about it.
The most important one is the firmware that contains all the necessary drivers for device's hardware.
I've installed the latest crdroid version today, too.
I didn't face any problems at all.
The bluetooth problem still exists for me though.
I guess it has something to do with android 11 itself, rather than firmware or ROM.
Too bad...