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by slantyyz 3066 days ago
I think your problem is more related to the fact that your MBP is using a U-class CPU than not having dedicated graphics.

I used the built-in GPU on my desktop with a 4K monitor and outside of gaming, it did not affect the UI snappiness at all. I would suspect that if you had the 15" MBP with the quad core CPU and turned off the discrete graphics that you would notice that the Intel HD graphics 4k performance is pretty good.