Take a look :

https://www.youtube.com/watch?v=4_5pGMgsq6A&feature=youtu.be

( 60fps video btw)

I have a really low framerate of a model window on OSX. Can anyone relate to this ? It seems like the window size itself is a problem. Drawing complexity has not much of an influence to this. 

I have a Macbook Air 2013, 2014 iMac ( both 8GB of RAM ) and an i7 Windows PC. This issue is related just to OSX machines.