Mid-2014 15" MBP 2.2Ghz QC no GPU.
For example when I use full screen apps and swipe between screens I notice a little laggage.
So it's not actually slower, but more "stuttery", prone to frame drops. We saw that coming since the iGPU in the new one is less powerful than the Iris Pro from the old... Is it that bad? What resolution scale are you using? You could try going one step down to 1440x900 which is the default setting for the old model (they adopted 1600x1050 on the new one and that can make UI transitions choppier).