using 2.5b1. Horrible performance and graphical corruption (same as with 2.4). Using external monitor with usb to hdmi dongle by unitek in general slows down whole system graphic performance wise. Attached 2 screenshots with examples of corruption.
And to give better understandin of what's happening when I plug in external display - without it whole system seems to be running at 60fps more or less, when plugging in the external everything slows down to 10fps (desktop switching, app switching etc.)
I'm not sure if switching to dell D3100 would be better option. It seems that it can handle 4k + 2xFullHD displays but i don't want to get stuck with expensive docking station and same issues....
Using El Capitan GM Beta and Macbook Pro 13" early 2015
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