Every Magento 2 page request that hits MySQL must first establish a database connection. On a busy store this sounds innocent, but at scale it becomes one of the biggest hidden bottlenecks: thousands of short-lived connections opening and closing per minute, each consuming CPU time, memory on the MySQL server, and precious milliseconds on the client side. Database connection pooling solves this by keeping a set of connections open and reusing them across requests. In this post we'll cover exactly what that means for Magento 2, how PHP's connection handling works under the hood, and the practical steps you can take today to reduce connection overhead and improve throughput. Why Connection Overhead Matters When PHP opens a new MySQL connection it performs a TCP handshake, authenticates credentials, negotiates character sets, and allocates resources on both sides. On a modern server this takes roughly 1–5 ms per connection.…