Problems with my.cnf and php.ini - Using mysql tuner

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http://serverfault.com – My server was running fine until a recent update in Plesk and now it has been slow. My server tech had to rebuild the Apache configuration file and ever since the sites have been slow. The server is the XL8 dedicated box from 1and1. it has 16gb of ram and an 8 core cpu. The server contains 2 fairly busy vbulletin forums and some smaller sites. Here is the current my.cnf as I set it- [mysqld] #bind-address= #skip-bdb local-infile=0 max_connections=500 open_files_limit=2100 datadir=/var/lib/mysql socket=/var/lib/mysql/mysql.sock user=mysql # Disabling symbolic-links is recommended to (HowTos)