James Hansard's Anderson inks WIP part 1

user of manga i got a question for ya. does your manga lag sometimes. like when i try to fill areas with bucket i miss and it lags for 2 minutes sometimes until it fills excess the color black and then i have to literally use menu to undo it ; not keyboard shortcuts. im on a mac but had this problem on 4 as well. whats your overall general thoughts on this program. also my system seems to freeze me out sometimes. i like the program for inking better then photoshop but hate the issues of lag. wondering if pc lags as well. thnks