on for ex. OG TBC client carbonite map was very smooth while dragged with LMB, now its pretty choppy

Works fine for me...

i recorded a comparsion to wotlk client, it's nitpicky, i know, it aint a issue, more like QOL idea, i would tag label as idea/improvement but there are no defined labels in this repo

TBC was based on BFA client, WOTLK is based on Shadowlands... check your Video options like Vertical Sync. Thats not something i can fix.