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That is true. I have a 15 retina and I do experience the graphic lag, mind you it is not ideal, though apple has improved it since it first launched . And to be honest i forgot about the lag, as I had huge issues with the wifi for a long time. All working fine now, but it took quite a few software updates to sort .

I had a 15" rMBP prior to my 13". It's noticable worse on my 13", to the point where I thought about going back to the 15". But at the end of the day portability is more important.

As much as Apple may have improved this in software, I feel this is primarily a an issue w/ the IGP playing catch-up to the needs of HiDPI scaling. Every new Intel chip seems to promise some 30-40% improvement so it will eventually be a non-issue, but right now I just don't think the graphics horsepower is there.

I'm here defending the rMB because TBH I was expecting it to be worse than this... to feel that it's in the same league as the 13" a refreshing surprise. At the same time I can understand how anyone coming for instance coming from an MBA would be underwhelmed by it.
 
I had a 15" rMBP prior to my 13". It's noticable worse on my 13", to the point where I thought about going back to the 15". But at the end of the day portability is more important.

As much as Apple may have improved this in software, I feel this is primarily a an issue w/ the IGP playing catch-up to the needs of HiDPI scaling. Every new Intel chip seems to promise some 30-40% improvement so it will eventually be a non-issue, but right now I just don't think the graphics horsepower is there.

I'm here defending the rMB because TBH I was expecting it to be worse than this... to feel that it's in the same league as the 13" a refreshing surprise. At the same time I can understand how anyone coming for instance coming from an MBA would be underwhelmed by it.

Ive only used the 15, so will give the 13 and MB a try in the Apple store this weekend to compare. thanks for the feedback
 
I use a 15" Retina MBP .. I don't understand what sort of "lag" you all are referring to .. do you mean the processor can't handle the windows and so everything slows down? .. or are you guys talking about "lag" in the sense of stuttering? .. because even my 15" rMBP does that sometimes .. are you experiencing this lag ALL the time? .. have you all given the notebook to finish indexing the files? ..
 
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