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Originally Posted by IanUK
I just had a thought, I wonder if the TCP setting or equivalent is set wrong on the Poplar Proxies (and others that only give slow speeds) ?
Would that explain the good results with UK based sites and bad ones with USA sites ?
Prolly not, but thought I'd mention it in case an NTL techy is reading this.
cheers
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It certainly could if that is indeed the commonly seen symptom i.e. download speeds are always slower on remote sites.
The TCP Receive Window limit (see info about RWIN on
http://www.dslreports.com/tweaks) can reduce peak download throughput from sites that have higher latency. A trace on a download will quickly show what the negotiated window size is and if it is too small for the connection, and I would have thought that support could do this quite easily.
It seems strange though that some proxies (or sections of networks) are slower than others, since I would have thought the TCP Window would be uniformly configured on all proxies. Poor perf could also be due to a dodgy switch cable or misconfigured port that's dropping a few packets, although that would be more likely to affect all sites, although retransmits will take longer (and hurt perf) on higher latency connections.