I want to use Photoshop(c6) to draw since thats what all the

You need a good CPU to be honest

I have the same problem with Clip Studio Paint now that I've downloaded a couple brushes. I use Sai to sketch and then I save it into a PSD file after I save it on Sai. Then I open it in Clip Studio for rendering because Clip Studio can open Photoshop files. You could do the same except with Photoshop

>>2816366
Try increasing the spacing of your brushes, sometimes a few % can make a huge difference.

Also, if I recall correctly, you can improve brush lag if you go into preferences > performance and either uncheck the "use graphics processor" option or go into "advanced" right underneath it ans switch drawing mode to basic.