Move your current .emacs file to a new name (like `.emacs.username.el`), and change the `"frog.el"` to that new name. This code will byte compile your (newly named) .emacs file upon exit, and upon starting up will load the byte compiled (unless the source is newer).

I chose not to byte compile on startup b/c the original purpose of this code was to speed things up, and loading and byte compiling will slow things down slightly...