1- Apache could be tweeked a little (more) to support more connections.
2- MySQL server could be configured also so it uses more RAM to cache queries and so on. Right now your server have half a Giga of RAM unused.
3- You have MANY records in your database and this wouldn't be such a big problem if you didn't have queries with multiple conditions and especially cross-queries ( that is, queries among different tables )
4- It is the first time I have to optimize such a big database so I can only guess that optimizing everything I can it would make the server go faster by 50% to 100% but I cannot tell you for sure. I may find some obviously bad implemented queries I can optimize and solve the issue but I may also find that this is the most you can get with a MySQL database on your Quad server.
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