Photoshop uses the Operating system brushes. They are improved, but that part is not their own.

I think all programs might start with the basic brushes and make improvements with a brush editor. Some programs are small with out much in them so the computer can update the screen easy without effecting the brush in progress. Any control over performance can't be done by adding anything, but work with less stored in virtual memory so the screen refreshing is quick without effecting ongoing task. Sai don't have as much stuff as Photoshop, and the over packed active options is what makes the brushes effect the the video ram.

With Photoshop CC 2014.1, if you stroke the brush with the mouse, and get ahead of Photoshop, then let up, it will dutifully complete the stroke to the point where you let up on the mouse. In other words, it will save you time moving the mouse to dismiss dialogs. Last update 18 Apr. 2011 Licence Free to try $9.95 OS Support Mac OS X Downloads.

Your profile is showing ancient G4 hardware and OS X Leopard. Os mojave wallpaper. The keyword is years. At some point, Apple rewrote the USB subsystem in OS X, and that result is in the current macOS. At some point, I updated its firmware, and right now, I have it connected into a USB3 port on a 2014 MacBook Air running macOS 10.13.5, and playing Oblivion using MacGo's Blu-ray Player Pro software. How old is your physical Blu-ray player?

It refreshes as rough as someone asking you to movie so the can clean under your drawing while you work. With some video cards if you have a large canvas to draw on it works better because the video runs better at full speed so it refreshes quicker and has less interference with the lines you are drawing, but with better video cards you need bigger power supplies to run them or they make things worse not better. Without a good power supply the video built into the main board is better and has less problems with screen refreshing. You will see a difference with watching videos. So Photoshop extra options and tools don't help computers run better, just like most programs they sell it for the options you can do and take cuts in performance thinking artist should use a top end gaming computer to run the program.

Windows is just as bad. The more it can handle the more they will use to make it look good, and end up no faster than a very old computer running very old versions. If you installed a old version of Windows on your computer like Windows 95, Photoshop and Windows would run so fast you will feel something is very wrong. It will do better and you could draw flawless lines if that is how you really draw.

I've had a look around and can't find any specific sites that show how to enable/use 'lazy mouse smoothing' on OSX. EDIT: Unless this does the job (SmoothCursor): - have not used and am not affiliated with the app/company SmoothCursor is a little utility that allows you to customize the acceleration settings of your mouse or trackpad separately. Totally recommended for drawing applications and FPS games*! Developer's site: LazyNezumi itself states: I’m sorry but there is no Mac support, and I don’t plan on ever providing any (this was already tricky enough to program for Windows, and I’ve never owned a Mac or programmed with them).