I work a lot in parallel too, and it doesn’t bring that many issues, especially in a file this simple. You start having issues in interior spaces (off course) and in big files where the orbit starts being a bit too sensible.
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But the “working” scene is a good advice, for any project. I usually have one in parallel and one in perspective, allowing me to snap from one mode (and set of parameters) to another.
I think you have a text problem.
Recently we’ve seen another similar case where the user complained about having difficulties to simply zoom in, out, orbit, just move around. and his file was full of 2d text lines that looks like text
Your file looks like you’ve made the whole file ready to print in sketchup. I’m guessing you just place the scenes in layout, adjust the scale and print.
But all the 2d lines and labels and dimensions are supposed to be made in layout, in 2d, not in sketchup. They seems to gradually slower SU. Especially since your text isn’t text but line segments (dimensions are SU made here)
Plus, looking at the texts like the one above, they are lines in a component in a group in a component in a component.

so yeah, I would remove all the 2d superfluous stuff, dashed lines, labels, dimensions, and add them only in layout
(the symbols for doors and the squares showing possible furnitures inside can stay, they aren’t heavy or annoying at all for SU)
Here is the file after a quick Tag purge (lots of lines and faces were on tags, I suppose from the IFC) and removing all the elements supposed to be in layout.
Does it feel faster ?
BTF clean .skp (11.9 MB)