I'm forced to use the Microsoft ecosystem at work and the sluggishness of it is a major source of procrastination. I find myself putting off small tasks forever, because waiting for word files to open, browsing folder structures in Teams, etc. are all mildly painful experiences. I suspect a lot of people do this, and maybe all of them don't even realize why they are doing this. The effect of sluggish user interfaces on overall productivity is probably well underestimated.

The same goes to some extent to anything with a web interface, for example Databricks.