Alot of the members of my forum are complaining of slow loading pages lately. I too have noticed it sometimes.
I checked the maker of my forum (vBulletin) and there is mention of a bug in PHP 4.3.10 They said the unsearlize function is abit messed up in php 4.3.10 PHP and that it has a crippling bug for some servers.
Here's a copy of part of that thread:
Performance Hit Since PHP 4.3.10 / 5.0.3
Many people have noticed that vBulletin (any a lot of other PHP applications) suddenly started to run significantly slowed than normal after installing PHP 4.3.10 or 5.0.3 in order to patch the security flaw in previous versions of PHP.
This cause of this slow-down has been identified as a problem with the unserialize() function in PHP. For more details, see http://bugs.php.net/bug.php?id=31332
This problem has now been fixed by the PHP developers, though the fixed version has yet to be released in a 'stable' version. However, the latest CVS snapshots of PHP 4.3.x and 5.0.x, available from http://snaps.php.net/
contain the fix and restore the original speed of unserialize().
While we would not recommend running a 'dev' version of PHP on any production server, we understand that the performance problem has been a major issue for some people. If you are badly affected, you may want to consider running a 'dev' version of PHP at your own risk in order to overcome the performance problem.
Will Lunar be doing anything to fix this? It's really frustrating when pages load slow or don't load at all.
BTW, I'm on the Lyra server. My forum is at: http://www.348-409.com/forum/index.php?s=
It doesn't seem to be slow all the time so it may appear fine if you go there to test it.