It depends,

if a dataset needs to be parsed from the chain then yes but then the speed varies a lot depending on what you need to parse.

if I only need to parse let's say the block's weight it gonna be super fast because I can skip a lot of things that I already parsed and don't need for that and so, keep the local databases that I have from the previous iteration.

Whereas if I want to parse (or reparse for whatever reason) the amount of sats per address then I need to recompute all the wallet's history and the databases linked to them which is very expensive.

There is also the much more common case when a dataset can be computed from other datasets which very very fast