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How to solve "0 ms (Request Canceled)" problem?
05-05-2010, 10:29 PM
Post: #17
RE: How to solve "0 ms (Request Canceled)" problem?
You have definitely graduated to the next level of performance optimization :-) (Just be careful to not over-optimize beyond where you see value in return).

FWIW, if you look in the data table there is a "Bytes In" value that will tell you the number of bytes for the response including the headers (but not including the TCP overhead. You may want to target a 1492 MTU (granted, just 8 bytes different) because DSL (PPPoE specifically) has 8 bytes of overhead on the wire.

Where you'll really see the benefit if you're going to start looking at packet-level data is in the base page or the initial request on any new connection. With TCP slow start you can usually get 2 packets out before having to wait for another round trip so for the base page make sure as much of your external references/head makes it into the first 2 packets as possible.

You'll also want to see if you can flush the document early. Not sure what technology is serving your pages but if you can force the head of the document out before making any database or back-end calls you will speed up the page getting to the users. You're basically looking to reduce the first byte time on the base page as much as possible (the fastest it can get would be to match the socket connect time - so the green and orange bars would be the same size).
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RE: How to solve "0 ms (Request Canceled)" problem? - pmeenan - 05-05-2010 10:29 PM

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