I'm seeing the script running slow and ultimately causing HTTP 500 errors on certain pages. Excerpt from php5 fpm log:
Code:
[10-Nov-2017 14:49:52] [pool www] pid 29142
script_filename = /var/www/html/index.php
[0x00007f0bcfc0f028] curl_exec() /var/www/html/core/vb/vurl/curl.php:342
[0x00007f0bcfc0ee98] execCurl() /var/www/html/core/vb/vurl/curl.php:279
[0x00007f0bcfc0ed38] exec() /var/www/html/core/vb/vurl.php:322
[0x00007f0bcfc0ebf8] exec2() /var/www/html/core/vb/vurl.php:236
[0x00007f0bcfc0eaa8] exec() /var/www/html/core/vb/api/content/link.php:91
[0x00007ffe30f2f200] parsePage() unknown:0
[0x00007f0bcfc0e8d8] call_user_func_array() /var/www/html/core/vb/api/wrapper.php:199
[0x00007ffe30f2f5b0] __call() unknown:0
[0x00007ffe30f2f8e0] parsePage() unknown:0
[0x00007f0bcfc0e710] call_user_func_array() /var/www/html/includes/api/interface/collapsed.php:91
[0x00007f0bcfc0e538] callApi() /var/www/html/core/packages/mdawgtitletagsvb5/api/content/text.php:174
[0x00007ffe30f2fe00] mdawg_title() unknown:0
[0x00007f0bcfc0e3e0] preg_replace_callback() /var/www/html/core/packages/mdawgtitletagsvb5/api/content/text.php:85
[0x00007f0bcfc0e2b8] mdawg_get_titles() /var/www/html/core/packages/mdawgtitletagsvb5/api/content/text.php:50
[0x00007ffe30f30670] getDataForParse() unknown:0
[0x00007f0bcfc0e0c0] call_user_func_array() /var/www/html/core/vb/api/wrapper.php:216
[0x00007ffe30f30a20] __call() unknown:0
[0x00007ffe30f30d50] getDataForParse() unknown:0
[0x00007f0bcfc0def8] call_user_func_array() /var/www/html/includes/api/interface/collapsed.php:91
[0x00007f0bcfc0dcc0] callApi() /var/www/html/includes/vb5/template/nodetext.php:560
The URL in question will not load with this mod enabled and triggers a MySQL "gone away" message email to be sent from vBulletin.
I disabled the script, and the page is able to load successfully.