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Site Slowed Down, Long Time to First Byte
07-29-2011, 05:57 AM
Post: #11
RE: Site Slowed Down, Long Time to First Byte
Great. I guess I'll just work on the homepage then. This all got started when we went to a new host and our bounce rates jumped.
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07-30-2011, 06:19 AM
Post: #12
RE: Site Slowed Down, Long Time to First Byte
(07-29-2011 05:30 AM)pmeenan Wrote:  That's not bad. What you want to do is compare the orange bar to the green bar. If they are exactly the same size then that's as fast as you could EVER be. Having a green bar around twice the size of the orange bar is on the better end of what I usually see.

Why do some files not have an orange bar?
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07-30-2011, 06:25 AM
Post: #13
RE: Site Slowed Down, Long Time to First Byte
The orange bar is for the initial connection to a given host for each TCP socket (browser connection). Once a connection is open the browser can re-use it for multiple requests so it's normal for most of the requests to not have the orange bar. If you scroll down to the connection view waterfall you can see how each of the connections is re-used.

In general, the orange bar should be the same size for all of the connections to a given host name.
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12-21-2011, 03:33 AM
Post: #14
RE: Site Slowed Down, Long Time to First Byte
(07-29-2011 05:30 AM)pmeenan Wrote:  And hence the "A" for first byte time :-)

What do you think would be the best course of action for diagnosing the long first byte time on the homepage?
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12-21-2011, 04:01 AM
Post: #15
RE: Site Slowed Down, Long Time to First Byte
It's going to depend on the platform, skillset and if you are using a 3rd-party content management system (Wordpress, drupal, etc) or if it is all under your control.

Most of the back-end tuning and diagnostics is going to require a developer and/or a sysadmin who know how the app works and how the pieces are put together.

My favorite tool for getting visibility into the back-end is New Relic: http://newrelic.com/ but you can also get by by instrumenting things yourself.
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04-11-2012, 08:10 PM (This post was last modified: 04-13-2012 04:43 AM by pmeenan.)
Post: #16
RE: Site Slowed Down, Long Time to First Byte
I have large time to first byte for static content on IIS 7.5, it's not site specific it's slow for all sites on that server. Web.config setting runAllManagedModulesForAllRequests is set to false, and gzip is enabled for static content. How can I troubleshoot this problem ?

Here are the timings, time to first byte for fairly complex ASP.NET site is 368 ms, and for just grabing css file is 617 ms !! That time is different every time but still too much, not below 200 ms that seems way too much for such task.

Server has plenty free memory (in this moment more than 7 GB).
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