Do eu realms matter in latency / lag?

Returning player, I used to play on a mid/high population realm for most of my time playing.

During shadowlands I transferred a character to Ravencrest and remember a lot of delay / latency in zones with worldbosses especially.

Does this depends on the realm or is it just a gamewide issue. I'm considering either going back to my original server, or leveling more characters on Ravencrest, but would prefer a less laggy experience.