Yeah, it wasn't very good general advice since it's based on this specific SVG file (which not everyone can even access).
Will be interesting to see the end result, indeed. It's looking good so far!
As for
What do you mean with "make the map run faster"?
Especially with the online minifiers (or by messing around in the data of the file yourself) you can cram a lot of extra stuff in the 2MB limit, but it tends to make maps slow.
To use a silly analogy: by pushing hard you can cram a lot more in a suitcase, but it will make for a very heavy suitcase.
I don't think this is relevant for your map; just a general advice.
Edited 10/12/2020 15:56:20