My PS3 and network:
cat 5e directly to router . No wireless.
My ISP test: 25 to 32 download, about the same for upload
PS3 in a DMZ. I've also tried UPNP and portforwarding, not at the same time.
Why would the PS3 test only give me 8 down and 2.5 up? Sometimes it gives me 18 and 5, but that is rare. If I do a test through the PS3 browser, I get the speeds I should get, or maybe just a little less.
I think this will only be fixed if Sony invests in more servers in more locations in the US.
I know the XBOX doesn't have have a network speed test.