Pretty much whenever I attempt to use Brushes in pixel mode, I get major major lag in performance, like 5 or more seconds sometimes, between when I draw and when the results appear on the screen. The problem seems to be more severe when using custom brushes, or the default included brushes when the width is increased to very large. I also get performance issues when I switch the blend mode from "Normal" to something like "Multiply". As far as I know, I have a pretty good computer - I've attached a few screenshots of the specs. I've also tried changing the "Performance" configurations but have yet to improve this lag. I've also tried closing running processes and applications.
Am I missing something here. My computer is super fast with regards to software development but I'm new to doing graphics related things so I'm uncertain if there's hardware that I'm lacking.
Thanks,
Andrew