Nice app – Artbook - Paint by Number Review

I have really enjoyed this coloring app for the past several months. However, it seems to lag a lot on filling in the colors. I have to wait for them to fill in after I’ve tapped on however many I’ve touched. This is the only coloring app that does this. Please check into why this is happening. It’s not just every now & then either. It’s every time I color. Thank you!
Review by Sweet game love it on Artbook - Paint by Number.