Role-Based Access Control: Why It Often Slows Client Sites and What to Do About It

https://www.scribd.com/document/990405970/How-Free-Migrations-Cut-Billable-Hours-What-Agencies-Rarely-Admit-206987

That moment changed everything for me: I was debugging a client site that crawled under load, then discovered the culprit was not caching or the database engine - it was the authorization layer