[jQuery] is jquery plugin slow down the page load ?

[jQuery] is jquery plugin slow down the page load ?


Hi
I have some jquery plugin for my web app. They are located on my
template header:
- jquery 1.2.6
- jquery ui : datepicker and dialog
- jquery flexigrid
- tablesorter
- validate
- jqalert
all of the are loaded on evey page, but I am not using all of them at
once. Only on several page I used them (but not all at once too).
Did this will decrease the loading speed of my web (I know about the
size that being loaded, but all of my js will be on the cache
right ?)
Did jquery plugins will be executed even if I never initialized it on $
(document).ready() ...
thanks ...