@me flash wasn't inefficient. you have to remember the kind of hardware and networks that shit had to run on back then.
the main problems with flash were it's abysmal security, the proprietary plugin thing and its non-accessibility. the first two have largely been fixed by modern emulators. the third one is harder but not exclusive to flash.
also, monkey's hind leg or something: I think a remote VNC session might make for a pretty good security sandbox for that crappy old flash player.