Post reply sometimes very slow

[Guy Verschuere]

Hi all,

I've been tuning lots of stuff for my SMF forum at http://urbexforum.org
Pages are loading extremely fast, a real joy to browse the forum.
Unfortunately I sometimes have the issue that submitting a reply takes  a long time. Mostly it's as fast as all the other pages, like when using the quick reply I don't even see the pagerefresh, that fast.
But, from time to time it takes up to 10 seconds.

Any idea where I need to start looking for this?
What information do you need?

Some details:
VPS dual core server with 4GB ram running Debian 7.3, PHP 5.4.4, Mysql 5.5.33
MemCached and APC opcode cache installed and active
Caching level set to 2 (Issue happens on all cache levels, even with cache disabled)

The server serves 2 SMF forums and 2 Wordpress sites, all with APC cache enabled. CPU usage and disk IOPS are almost idle.

Thanks!

[kat]

Let's try to isolate this, shall we?

Can you confirm, or not, that this is happening for any of your other members?

What about a trying a different browser? Is that any different?

[Guy Verschuere]

Other members are confirming the issue.
I just tested with several browser (Chrome, Firefox and Safari on OSX) and it happens everywhere.

[Guy Verschuere]

Just think of something: on the bottom of the browser it says: "Waiting for http://urbexforum.org"

[Storman™]

I see you have a redirect in place, not sure if thats relevant to the issue though ??

[Storman™]

After reading your post again I see that this is actually an intermittent problem.

Maybe disable the the adverts and see if that makes any difference. I think you have asynchronous ads which should load quicker but I've seen many instances where they actually hold up the loading of the page. Not saying it's the issue but worth looking at.

[Guy Verschuere]

What did you mean by the redirect?

Disabled the ads for now, I could return to the old adsense code if that would cause the issue.

Thanks for thinking with me!

[Storman™]

What did you mean by the redirect?

Actually I take that back, was referring to the www page at http://www.urbexforum.org/  but it does nothing apart from inform.

[kat]

I've just taken a look around. At first, the place was really, really fast. But, then, everything just kinda went really slowly. It even came to a complete standstill, a couple of times.

I think you might want to have a word with your host, about this one.

[Guy Verschuere]

That's something new. I never had issues with loading of pages, only when hitting the post button.
It's a VPS server, everything 's up to me.

[kat]

I just want for another look and the place is as dead as a dodo.

[Guy Verschuere]

You must have created more than 10 error's, then you're banned for 24h :p

[kat]

Yay! That'll be helpful, then.

[Guy Verschuere]

Deactivated that system for now

[kat]

Back to super-whizzy! Well, what little I can see, without being told to register, is.

[Guy Verschuere]

That's true, very closed forum. If you know urbex you know why

[kat]

Done a bit, myself, in London and Manchester. Did a lot on the railway, too. Having a pass for all sorts of parts of the railway helped.

[margarett]

You should activate the option to show page loading time and add $db_show_debug = true; in Settings.php
So that you can at least try to identify a problematic query, maybe

[Guy Verschuere]

Page loading time is shown at the bottom
Added $db_show_debug = true;

[margarett]

The new informations will only show to you as admin.
So, try to cause that issue and check the results at the bottom