Upgraded from 4 to 5 - our biggest forum shows up empty (No body)

[bar10dr]

Hi.

Ran the updater just fine.

We have a forum where one forum has 95% of the posts, and 15 other forums with assorted threads in them (Our big forum has over 3.5 million posts spread over 250,000 threads).

All the small forums work fine, I can go into them and see all the threads.

Our one big forum just shows an empty page when I go into it, chrome shows it loading for more than 6 seconds before we get a reply.

Makes me think there is some sort of timeout going on? Database timeout perhaps?

[bar10dr]

I added "ini_set('memory_limit', -1);" to the top of the config.php file and the forum is now showing.

The problem is that it takes almost 8 seconds to refresh the most used page of our forum now, this is not acceptable.

Is there any way to make the forum refresh go quicker, or is vbulletin 5 simply much less effective than vBulletin 4 when it comes to having a large amount of posts in a forum?