I have an old version of phpfox, it needs security messures against spammers, it needs to be cleaned and made to work properly again. General maintenance.
Optimize the phpfox site by using memcached (if available with the old
2) Switch your database tables for this site to Innodb to help prevent entire
tables from being locked as innodb supports row based locking. This is a
fairly easy process and can be reverted back if issues arise.
3) Look into other options for caching (Opcode Caching, Varnish, etc)
4) Perform some forum maintenance
5) put in catcha