Really, I do like the performance of a Core 2 Duo over something like an Atom, although I think it's today's bloated software that's to blame for us "needing" such performance.
I've got an Acorn RiscPC with a 233 MHz StrongARM (roughly 1.0 DMIPS/MHz - so just over a TENTH of the speed of a 1 GHz Cortex-A8 (which is at 2.0 DMIPS/MHz, and almost five times the clock speed) - and that's not counting the fact that that 1.0 DMIPS/MHz figure is on a 64-bit wide, 66 MHz data bus... and the RiscPC has a 32-bit wide, 16 MHz data bus, so anything that doesn't fit into the CPU's cache is ridiculously slow,) and it's perfectly usable online.
Want to know how?
The OS, RISC OS, is a very, very lightweight OS - it fits into 6 MiB, and an older version that's just as capable at internet browsing (well, OK, it doesn't have a DHCP client, but once you get an IP address...) is in 4 MiB of ROM.
The web browser? It's an open source browser, called
NetSurf, that was developed from the ground up for this platform, but there's a GTK+ port, so it'll run on *nix. It's got good HTML and CSS support, although it does have the rather huge drawback of missing JavaScript altogether. However, it's one of the projects in Google Summer of Code, and one of the biggest things they'll be working on is fixing the DOM so that JavaScript is feasible.
Myself, I'm a
proponent of green software. The reason why hardware is so power consuming nowadays is because it has to be, to keep pace with modern software. But modern software is coded inefficiently because "you don't have to worry about CPU and RAM, they're cheap." I've actually been told that many, many times. Ridiculous.