Slow Reply
 

I am looking after a site which has a vbulletin forum on which is quite small. There was an issue with an advertisements mod, which was causing multiple sleep processes writing to another DB and grinding the forum to a halt. Since disabling this modification the forum flies.

However, when replying to a post, the user replying sticks on the reply screen for ten seconds, before being taken back to the thread where they made the reply. However, the reply is registered within one second on the forum. I have tested this with two browsers open.

The server the forum is on, is extremely highly spec'd out. It hosts several sites and several forums, including a fairly active Political Forum - www.politicsandcurrentaffairs.co.uk , which is extremely responsive.

The server spec is:

DUAL Processor Quad Core E5420 (2.5GHZ, 2X6MB, 1333MHZ FSB)
8GB Memory
2 500GB SATA II Drives 7200RPM mirrored.

The load on the server is minimal.

I have stripped back all mods on the forum and tested, including just using the default VBulletin skin, yet we still encounter the same problem when replying to a post.

The forum in question is: www.affiliateguarddog.com/forums

Any ideas?

Did you gave tuning-primer / mysqltuner a try already ? Also enabled mod_status to see what your Apache is doing all the time ?

Hi,

Yes I have run mysqltuner. No major issues there. I'll enable mod_status and monitor the apache service.

But as I said, this is not a resource issue. My politics forum of near 500,000 posts which has on average 30 - 40 people connected at any time, flies. As do the other sites on the server.

The load on the server is minimal and the spec is such any site should run fast.

This is what is bugging me about the submit reply on Affiliateguarddog.com. As soon as you hit the reply button, it is entered in the database, and you can see it there using another browser and hitting F5 one second after hitting reply.

Yet the person posting the reply, sticks on the reply screen for up to ten seconds. When for my politics site, hosted on the same server, you are returned to the thread within a second.

Any ideas? Has this problem been encountered before?

Some kind of plugin maybe ? Checking the transferred headers on the client to see where it stops loading the page within an acceptable time.

I have disabled all plugins, but still the same.

You mean the status bar in the browser to see what files are being called?

If so, nothing noticeable.

Nope - I meant some kind of transparent proxy (Webscarab as example) or a sniffer like Wireshark running in background that you've a live dump of the network traffic.
Then you should be able to see which URL's are loaded and which ones takes so long :)

Or - may be some problem with the configuration (GZip) as example

Did you also try with all modifications turned off and a default style?

This was enabled in VBulletin. I disabled it and now it takes no more than 2 seconds after submitting a reply to refresh the screen. :)

Although I now have another problem, which I will start a new thread on.

Thank You!