Another embarrassing problem with my MBP: when scrolling in e.g. Chrome, Safari or actually – any other window, there is annoying lag. When you scroll continuously, it’s more or less fine, but when you pause to read and then want to scroll, it stutters.
After a bit checking here and there, it turned out that if I increased keyboard backlight timeout from 5 seconds to 1 minute, the problem has been worked around!
Well done Apple, well done‼