I've really tried to make photoshop work for doing lineart but it is always so laggy compared to other softwares. I have a 16gb ram and a 2.8 Ghz processor which I think should be enough? Even if I use a 14 px hard round on a 600 dpi canvas I will experience some lag. It really feels really bad to draw on. Any kind of setting that increases performance inside PS itself I have already tried. Preference settings, spacing, smoothing off, purge.