MacBook :: Safari Slow With OS 10.5.5?

I have the macbook 13 inch 2.0 ghz version. It currently has the MAC OS 10.5.5 my problem is most of the time in safari the webpages load up pretty slow, feels like Im on dial up even though Im only a couple of feet away from my WiFi router. The webpages start to load up about 1/8th of the bar and then pauses then it starts loading up slow. In my PC with XP and in my laptop with XP the internet loads up pretty fast and normal.

My wifi router is a linksys WRT54GS with firmware v4.71.1 and my current setting for the macbook wifi is DHCP with manual address. For some reason I dont know why it wouldnt communicate with my router if set to "Using DHCP," it wouldnt even get an IP. But it communicates if I set it statically even though I've already increased the number of DHCP Address in my router.