Question about the vB BBCode Parser
 

Just a general question on the speed/efficiency on the current (and past) vBulletin BBCode system.

How many iterations does the BBCode system take? Is it one or multiple passes?

Each time bbcode is coverted to html multiple preg_replace calls are made, check out the function parse_bbcode2(); in functions_bbcodeparse.php.

This is why the post cache is so important, by saving the raw output in a second table you avoid extra processing everytime someone view's a thread.

there is a setting of vb (just accessabel when operating in debug mode) where you can define if vb should parse recursive/fast or whatever the thrid was ^^