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Originally Posted by IanUK
I can understand that if you are pulling in a cached file from one of the proxies, then you will get better speeds, but my own experience seems to suggest that the Poplar proxies are not caching *anything* from the USA (ie: virtually nothing goes above 150k) whereas the Colchester/Hersham/Swansea proxies cache *everything* I look at from the USA (ie: virtually all sites at 350-370k), which cannot be right.
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Yes that does sound strange.
But the key here is that I was only testing one object from one point (although over several different network paths) and you can't really do a reliable diagnosis from that. So more data points are required. Plus TCP window size is just one of several things to check in a trace e.g. there could be packet retransmits etc.
You can check whether an object is cacheable (and cached) by examining the HTTP headers. It should be pretty obvious.
You can always use the cacheability checker
http://www.ircache.net/cgi-bin/cacheability.py if you don't want to use wget.