[kh99]

I'm not sure, but I wouldn't count on an upgrade fixing the problem.

I think I'd try using something like the Firebug addon for Firefox and see what's taking up time when you load the thread page. If it's the main request (showthread.php) then you could try disabling all plugins to see if that does anything (edit includes/config.php and add the line "define('DISABLE_HOOKS', 1);").

You can also put the site in debug mode (again in config.php, add "$config['Misc']['debug'] = 1;"). That adds some info at the bottom of the page, and you can click on the (?) after "Queries Executed" to get a list of the db queries and how long they took.

Both of those config.php chnages are temporary things that you will want to take out when you're done.