10.5 upgrade has made my mac and most programs/dvd/ video slow

i just upgraded from 10.3.9 so i could use a new external HD. So far, it has been slow in all departments (wifi signal is lower than its ever been, programs, downloads, general navigation etc). Games are warpy, DVDs either wont work or if they work they are very warpy/skip frames. Overall my mac with 10.3.9 did very well in all departments, but since upgrading it has been no where near its previous speed and capibility.
Things i've done so far....
I've run DU many times but system still says its ok. Repaired permissions (which takes forever). Reinstalled 10.5 and archive and installed-nothing. Downloaded all updates available. Reset PRAM.
Should i erase HD and install 10.5 fresh? Does running DU from leopard DVD make a difference? Anything else?
help!

Hi have you tried starting in safe mode
http://docs.info.apple.com/article.html?artnum=107393
http://docs.info.apple.com/article.html?artnum=107392
russ

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