I think everything has been said on the dell issue, so I might comment on HP: I loathe them. Their support is marginal, at best, and their website was, when I needed it, completely unstructured, incredibly hard to navigate and certainly not crosslinked well. It took one day to find the most basic info on a tape drive made by them, and two more days to actually find where they had hidden (yes, they seem to hide, not make available, things) the manual for it which, BTW, was crap.
As for the FPS issue: The internet connection does not have anything to do with FPS AFAICS. What will make the difference is the quality of the hard- and software and how it is configured.
For example, you can have
1) a slow motherboard chipset
2) slow RAM
3) BIOS at \"failsafe defaults\" instead of \"performance\"
4) loads of unnecessary background tasks hogging the RAM, and eating CPU cycles
5) cheap processor (Celeron vs. Pentium), which does more GHz but less work
6) bad graphics card, maybe even with shared memory
7) old drivers that slow things down
8) driver-driven \"hardware\" instead of intelligent, dedicated SPUs for sound, networking, modem, etc.
9) older / newer CPU revision that has different base clock and cache memory
etc, etc.. Subtle things like the northbrige and other mainboard components can make an insane difference nowadays.