The "chunk" size within the rebuilder was updated in 760 to handle modern servers. But for whatever reasons, you can revert that update. I had added notes within the script of the 75x and 76x settings, just in case -- for "special case servers." on extremely limited shared hosting, old hardware, extremely throttled process times, limited memory...etc


FILE: /admin/dorebuildcontent.php

Code
// -----------------
// Pre-2012 / PHP4 ERA (UBBThreads 7.5.x DEFAULTS)
//	"posts" => 200,
//	"posts_utf8" => 100,
//	"forums" => 100,
//	"pruneorphans" => 50,
//	"signatures" => 200,
//	"topics" => 500,
//	"private_messages" => 200,
//	"postcounts" => 200,

// -----------------
// Post-2012 / PHP5 ERA (UBBThreads 7.6.x DEFAULTS)
//	"posts" => 800,
//	"posts_utf8" => 400,
//	"forums" => 200,
//	"pruneorphans" => 100,
//	"signatures" => 800,
//	"topics" => 1000,
//	"private_messages" => 800,
//	"postcounts" => 800,

$limits = array(
	"posts" => 800,
	"posts_utf8" => 400,
	"forums" => 200,
	"pruneorphans" => 100,
	"signatures" => 800,
	"topics" => 1000,
	"private_messages" => 800,
	"postcounts" => 800,


Current developer of UBB.threads PHP Forum Software
Current Release: UBBT 7.7.5 // Preview: UBBT 8.0.0
isaac @ id242.com // my forum @ CelicaHobby.com