Q: safari has lags after new router installed

On my G5 Power Mac running 10.5.8

I use a hawking HWDN2A USB wireless adapter

I have an Xfinity modem

I added a linksys E2500 router about 40 feet away

Prior to all he new router, the xfinity modem has its own built in (not very good) router.The router was turned off by Comcast when we installed the new router.

There are 4 different computers in this house, this Mac and 3 different HP laptops running either Vista or 7

In order to upgrade speeds, we added the new router. The result is much better speed. On my Mac, using Speedtest by OOkla, I average around 18.5 Mbps download/ 3.5 upload.

The computer running Windows 7 (Firefox browser) works fine. It's pages load quickly. I tried Firefox on this Mac, same results as Safari.

Now Safari is acting weirdly. Cached webpages load quickly, as before. However, a request for a new page can take up to 10 seconds to begin to load. It seems indiscriminate. Some sites load up immediately, some take forever. Also, in Safari's google search field, an intial search takes about 5 seconds; from the Google site, it's instantaneous. Both were instantenous with the old router.

I've followed a bunch of suggestions from these forums.

1. Changed DNS to ones recommended by namebench after I ran a number of tests using that application.

2. Changes channels on the router

3. cleared DNS cache using terminal (dscacheutil -flushcache)

4. Added a new location, using OpenDNS DNS servers (copied IP address, subnet mask, and router setting from the active location)

5. Ran applejack AUTO for a deep cleaning and permissions repair, just in case.

Nothing.  No change.

There must be something I*'m missing. Any ideas?