The new version of Sketchup is particularly slow to open. Many coolaboartors are impacted with this.
We use z240 or Z2 as workstation and previous version of sketchup where ok.
I just timed it, it took 4min 20 to open the file.
It’s a 50 mb file, but it’s almost the same with a file I was opening before of 1.7 mb.