You likely don't need to optimize anything; Emacs has seen some pretty significant optimizations recently (native Emacs Lisp compilation, tree-sitter modes, better handling of long lines, etc.) so performance is rarely the issue.
However, you do need to avoid call-process (spawning blocking processes) as much as possible. Also, my experience with TRAMP has been pretty awful due to the fix for https://debbugs.gnu.org/cgi/bugreport.cgi?bug=12145 (literally: TRAMP blocks all of Emacs while waiting on a network connection).
However, you do need to avoid call-process (spawning blocking processes) as much as possible. Also, my experience with TRAMP has been pretty awful due to the fix for https://debbugs.gnu.org/cgi/bugreport.cgi?bug=12145 (literally: TRAMP blocks all of Emacs while waiting on a network connection).