optimization - Testing user bandwidth and tailoring page layout/functionality to match -

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i'm interested know if has worked on website need cater users vastly different bandwidths? i'd tailor site different user groups

1) low bandwidth ( <56kbps dial up) low res images - no javascript framework, no background images  2) medium bandwidth ( ~256kbps dial up) medium res images, smaller background images, small amount of jquery  3) high bandwidth ( > 1mbps) full site

are there techniques use test bandwidth speed, maybe set cookie remember (to stop page running test every single time), , tailor included css/javascript , image urls depending on result?

at previous company (a wimax isp), wrote speed test customers test speed of connection our network. ended custom web server hacked in perl, served static pages in sub-domain.

the speed test javascript tool sent randomly created(*) string special address on server, made mark when transmission began, when string received, , sent equally random string client, marking end of operation. server had 3 timestamps (start receive -> end receive == start send -> end send), calculating upstream , downstream speed , sending these last line of text in response. javascript part extracted last line , knew connection speed.

if use standard hoster, chances can't implement own server, though...

(*) random string generated routers not taint measured data due compression of the data stream


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