I got the same issue, youtube fine , showmax buffering like crazy without ANY ability to "pre-buffer" . I'm not sure if it's my browser or what, but even youtube you can "pause" and have it download a few minutes ahead so you can watch without interruption, i can't seem to do this with showmax.
So i gave up, every second time i had to deal with this nonsense, and i cancelled. Decided to jump through all the hoops to get onto Netflix...and holy smokes batman , not only does Netflix know exactly what i watched last, it knows where exactly i was IN the movie/episode across all my freaking devices... And i can properly pre-buffer too, not that i seem to need to.
I had Netflix years ago, but back then it was like Showmax is now. If Netflix were to launch in SA right now, it would sink all the competition.
Also, Xbox 360/Xbox One Netflix apps...magic . I had to jump through a few hoops to get it going on my Xbox 360 (had to make a US account and log in with it) , but Xbox One had no issues (only had to change region on the console) .
Sorry to say, Showmax is not there yet... and i'm not even talking about the content here.