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Comment by x3sphere | Hacker News Reader

Not surprising. The MBP Retina suffers from such lag as well, unless you go for the top of the line model with the dedicated graphics card. 2160X1440 res is too much for these integrated chips to handle.

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If the higher end model uses one of the i7's with Intel's Iris graphics (still an integrated GPU), it'll have no problem. I have one powering my 2560x1440 laptop connected to another external monitor, and it drives both screens in native-res games just fine. It's more capable than the discrete ATI Radeon was in my older i5 laptop. It's also an Ultrabook (0.6"), so the same chip shouldn't have any size/thermal issues with being stuffed in an SP.

I've run 2x monitors with a 3840x1080 desktop for 9 months without a hitch on hd4600. No lag at all, albeit I'm talking Arch + KDE running kdenlive / krita / karbon / kdevelop / freecad / blender / Firefox / qtcreator / etc.

In my experience that was only true of the Ivy Bridge models. I've used both the 13 & 15 inch Haswell Pros, and neither seems to have any appreciable GUI lag, with the possible exception of scrolling/resizing sites with very complex layouts in Chrome.

OSX has some really odd lag issues with the UI and responsiveness.

I'm running my lenovo win Win8 dual monitor on the 1377x768 & 2560x1440 external monitor and I don't see any UI lag. This is on an older Intel HD3000 integrated chip.

My 13" MBP from the same time lags even if I'm using just the built in screen.

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