The most popular GBA screen mod (the 9380 IPS kit) is known for input lag – it adds 3 frames of delay (around 50ms) compared to the original screen. I recently learned about a less popular Funnyplaying ITA TFT screen mod, which uses an original DSi lower screen with an adapter to fit the GBA...
hahahaha I'm half way through a bag off my Volcano and my tolerance is way down because I haven't been smoking much lately, so I was a little slow to catch that that was what your angle was