I totally agree the example I posted is ridiculous. Let me explain why I did it.

I was a hackintosh user for years. I got an old lenovo from 2007 with an intel core 2 duo and thought it would be fun to install OS X Tiger on it. Install went smoothly except the intel integrated graphics wasn't supported.

I decided to check out System Preferences to see how much had changed in all these years. I immediately noticed this perfectly smooth animation between panels. I couldn't believe it was so slow - and with no graphics driver! So I tried it on my rMBP and it was incredibly laggy. I just quickly recorded it with my phone and thought I'd show just one small part of OS X that really represents a much bigger picture of UI performance regressions.