web browsing and your OS are seperate issues, assuming your OS is functioning properly. because your web browsing issue is solved the same way no matter the OS. Especially in regaurds to Flash content. witch by the way "elaborate and dynamic pages" are probably flash, flash is used for more than games and video content.
flash performance issues are almost always solved by downgrading from the latest version, I dunno which would be best for what OS, but for example, im on winXP so i chose to use Flash Player 11.1.102.55 and is currently working out really well for me ATM
http://helpx.adobe.com/flash-player/kb/archived-flash-player-versions.html
and heres the settings page
http://www.macromedia.com/support/documentation/en/flashplayer/help/settings_manager02.html
browser wise, i don't think anything currently beats firefox with below addons, if there is anything better please let me know.
- adblock plus
- noscript
- imglikeopera (not compatible with the latest FF i think)
Lubuntu an any other distro mentioned is probably good, but still obeys the basic hardware vs OS kernel driver compatibility that no operating system currently escapes from. The mainstream Linux distros probably support a wide variety of common systems out of the box, however i don't think netbooks are quite common or mainstream.
Im currently on a netbook, but its an Intel Atom. I don't know about the AMD cpu and chipset based netbooks. but mine is only 1GB ddr2 5400rpm HDD formatted with winXP, and it runs Great. Probably faster than anyone would expect cause for some reason most netbooks i see don't have XP on them. I think its safe to assume mine runs faster than Larrys with 4GB+SSD. Since mine is more than useable. If Larry's is an AMD aswell, you guys might be at the mercy of AMD and ur chipset, possibly. Assuming your not attempting to play a modern graphic intense game or heavy multimedia editing?which should be done ona desktop
good thoughts however, judging by its description that may only possibly be benifical for the intel Atom netbooks