So I got a 2017 27'' iMac. The top spec model. I've noticed that animations on certain apps is very sluggish. Like when I maximize Firefox it's extremely sluggish. Youtube on Safari is not very snappy as it should. Feels like my 2015 MacBook is much more responsive. The iMac is brand new and I even restarted with nothing running in the background and it keeps doing the same thing. The overall performance of the machine doesn't feel like it should. Not sure if I can run a benchmark to test things? Any suggestions?