MantisBT is a PHP bug-tracking application that grows quietly. A tracker that felt instant with 500 issues can crawl once it holds 40,000 issues, tens of thousands of bugnote rows, and a decade of file attachments. When users report timeouts on view_all_bug_page.php or the summary graphs stall, the instinct is to request more RAM. On a Managed Cloud Shared Hosting account running LiteSpeed on CloudLinux, the actual constraint is almost always visible from your own control panel, and most of it is fixable without leaving the hosting user context.
The sections below walk through identifying which resource is genuinely saturated, then applying targeted fixes through cPanel Jupiter, DirectAdmin Evolution, .user.ini, .htaccess, and phpMyAdmin. Only after these are exhausted does a Cloud VPS become the honest recommendation.