Hi, I just purchased a new imac 21.5" One of the standard ones with 4k, 8gb, i5 3.0ghz. I went for the cheap HD. I thought this would be plenty good as I prevoiusly had been running RT from an 2012 laptop with a 4gb, i5 processor running Ubuntu.
Now, with the new imac I find that when i use the sliders to adjust just e.g. exposure, contrast, temp, or anything, or manually adjust tone curves, things are lagging and jerking so much that it is hard to operate them with any precission. I find the same problem on all distributions I tried (all 5.x)
What is wrong? I am aware that the machine I bought is not the most powerful machine on the market, but still, its a lot more powerful than the previous machine I had, which ran RT just fine. Is Ubuntu that much better than OS X, is RT not optimized for OSX, or did I just get a monday edition?
And what should I do? Should I return the imac/upgrade it? If so, is RAM, a faster processor or faster HD the way to go?