John Walsh got to thinking about performance when it comes to the MySQL functions versus MySQLi in PHP - this quick post is the result:

I've decided that a little investigation in weather it can connect,query and close faster than the MYSQL function I prefer the MYSQLi version as the _connect function is a lot more organised with the DB select in it.

The code used for the benchmarks is simple - just a connect, query and close (no fetch). The results of running each 1500 times shows that, by a pretty narrow margin, the MySQL extension comes in around 92 milliseconds faster than MySQLi.