[Web-SIG] Large, fixed latency on every wsgiref response

Graham Dumpleton graham.dumpleton at gmail.com
Fri Jun 8 02:19:05 CEST 2012


Are you using an IP address or DNS name?

http://appletoolbox.com/2010/09/fix-safari-slowness-stalled-page-loads-by-disabling-dns-prefetching/
http://support.apple.com/kb/TS2296

Graham

On 8 June 2012 07:09, Matt Chaput <matt at whoosh.ca> wrote:
> I'm using Paste script to configure a wsgiref server on Windows. And I'm
> seeing some weird stuff.
>
> On Safari, every request gets almost exactly 1 second of latency tacked on
> (the amount listed in the network diagnostics pane varies per request:
> 1.03s, 1.09s, 1.08s, 1.12s...). Every request. Even when the actual response
> takes practically no time (e.g. a 304), the connection latency is huge.
>
> On Chrome, the latency is smaller (around 300ms) and not on every request.
> Hovering over a request with the latency in Chrome's network pane shows the
> following information:
>
>  DNS Lookup: 1ms
>  Connecting: 302ms
>  Sending   : 0
>  Waiting   : 15ms
>  Receiving : 27ms
>
> Firefox also shows a large (1s) "connecting" time for some requests and no
> delay on other requests in the Firebug net pane.
>
> The only reason page load is barely tolerable is because at least with
> threading some of the delays are in parallel, but it's still slow.
>
> I have no idea what's going on here. Any ideas?
>
> Thanks,
>
> Matt
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