Speed up loading emacs by compiling packages

Question

With packages loading such as orgmode, nxhtml, yasnippet, I see that the loading of emacs slowed down pretty much.

I expect I can speed it up with the compilation of the packages.

• I can I do that with emacs?
• Normally, how much speed up can I expect?

Answer 1

Yes, you can do it: M-x byte-compile-file on each .el that you want to compile. It won't speed things up as much, though, as will using "autoload" and "eval-when-require".