From what I can guess, it's to do with the physical Roblox servers and your distance from them. Runners from Europe are a bit unluckier, as most servers reside in the US.
It can be really janky tho, because sometimes doors will take a solid 5 seconds to load, but on other days it takes no time. I think it really depends on ping and your internet.
I try do some runs for a speedrun and yeah i saw that in some run the rooms load like is nothing and in other take from 4 to 7 seconds, i lost 30 second in one attempt just for room loading
The fact that I could have saved over 20-30 seconds alone from door ping is annoying :(
it also depends on the room the game is loading, like when you enter 49 it almost always takes a little longer
Welcome to the fourth article of the newsletter; Apologies for the big delay since the last one but hopefully things will speed up from now on. this time we have so much to cover so bare with me.
(notable) world records