does rotmg use procedural generation?

This might have been asked before, but are dungeons in rotmg actually procedurally generated? or are they picked from a handful of predetermined maps that are always the same, therefore allowing you to cache the maps. ez trooms

They are randomly generated upon entering, that is why I believe no one has been able to make a troom finder or any thing in that regards

Yes, RotMG uses procedural generation to generate the map when the portal is entered for the first time. As Matthew said, it is not possible to create a troom finder, but there are some legit tricks you can use (i.e. the lava in abysses)