Please excuse my bad English.
I tried pixel brush tool and I found out when I try to draw quickly its reaction gets slower.
For example,
■■■■■■■■■■■■■■■■■■■■■■ This is what I want to get,
■■■■■■■■■■■■■■■■ But this appears.
At first time I thought it was a problem on my pen tablet or its driver.
But I found out same thing happens with laptop touchpad!
What should I do?
My Mac OS version is OS X Yosemite 10.10.2.