How old is your computer? Does it have a decent amount of both processor speed and RAM?
How large are the files that you have open that are giving you lag?
I am nowhere near a power user as I use only emacs for Org-Mode but even with a few of my insanely large PIM files (BookNotes.org which contains the notes and highlights to every every nonfiction books I have read in the last 10+ years) I have never encountered any lag in emacs.
Two questions about your situation.
I am nowhere near a power user as I use only emacs for Org-Mode but even with a few of my insanely large PIM files (BookNotes.org which contains the notes and highlights to every every nonfiction books I have read in the last 10+ years) I have never encountered any lag in emacs.