> Thanks in advance.
I've that at the start of my .zshrc :

autoload -U zrecompile
[ -f ~/.zshrc ] && zrecompile -p ~/.zshrc
[ -f ~/.zcompdump ] && zrecompile -p ~/.zcompdump
[ -f ~/.zshrc.zwc.old ] && rm -f ~/.zshrc.zwc.old
[ -f ~/.zcompdump.zwc.old ] && rm -f ~/.zcompdump.zwc.old


with that, if you modify your .zshrc you pay the compilation time cost.
else, it's very fast
-- 
Pierre Habouzit
 
http://www.madism.org/