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VM don't use transparent proxies anymore, nor would that have anything to do with it.
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Yes it could if all HTTP traffic was being routed via the proxy server and that server was slow but all other traffic went around it.
I assume that transparent proxies contain a cache of pages requested by other users (via HTTP) and if I ask for the same page, I get the copy from the proxy cache and not from the host web server. If the "Is this page already in the cache? No, okay pass though to the host web server" operation was slow, then it could theoretically slow down all HTTP requests. I know that proxies are designed to actually speed things up but they could go bad. They are one of those great ideas let down by the detail (pages not refreshing fast enough when you press F5 is the usually problem).
A bit more anecdotal evidence for just HTTP traffic being slow - I downloaded a TV program via uTorrent and it ran at full speed. At the same time, speedtest.net was reporting slow.
I'm not saying it's a transparent proxy causing the problem (esp. as you say they are not used by VM) but that *something like that* could be doing *something* with HTTP traffic alone which would explain the symptons.
As Microsoft File Transfer and torrents manage to run at fill speed suggests to me that it's not my local loop that's over contended. Equally, it suggests that whatever route is been taken to the target servers is also not overloaded so VM's core network is not overloaded.
However, as has been said, it could be the route to the speedtest sites that is overloaded.
Cheers, Rob.
---------- Post added at 10:08 ---------- Previous post was at 10:02 ----------
Speedtest.net to Preston reports slightly faster at 12Mbit/s this morning. Speedtest.net to London 50Mbit/s. vmspeed.com also 50Mbit/s.
I think that kind of answers my original suggestion that it was either a) poor throughput/response to/from the test sites or b) some kind of HTTP throttling.
Those results do point the finger very much at (a). Whether it's overloaded Preston speedtest server or infrastructure is moot as I can rest assured it's not VM at fault, at least not locally ;-)
Cheers, Rob.
---------- Post added at 10:09 ---------- Previous post was at 10:08 ----------
PS. I actually refer to another post I made here, not this one.