This is a bug that goes on for years and years and is getting worse.
When my model reaches a certain size and complexity (nothing insane, maybe 10 MB in size, 40-50 components, 10-12 tags in subfolders) it gets increasingly impossible to insert new components or copy -pasting any content. To insert a simple 2D-tree or 2D-person via component browser or by copy-paste may take 15 minutes (!!!) or not work at all.
W. T. F???
Is SketchUp/Trimble happy taking my money but obviously unable/unwilling to fix bugs or is this a feature I#m not aware of?