I use a 9370 and haven't noticed this. It might be that my typing speed is too slow.
That said, I only use the builtin keyboard when away from my desk. I have a thunderbolt dock with a full-size keyboard; for most devs that have a real office this is what I'd recommend anyway.
If you can't use a dock most of the time and you like the XPS 13 otherwise, the most recent LG gram is also very nice and has a better battery life to boot.
