bandwidth slow until apache restart

Ive noticed that all webpages seem to be slow until, i restart apache
Obviously I cant restart the service everytime I want to get good speed, so how can i fix this problem

I've had a look at my message/logs
and that keeps coming up with eth=0 tcp=drop

I've installed zend with mmcache configured with zend
My server load is only .26

Memory usage is at around %50
and swap file is at around 90%

The server is only getting about 50k impressions a day combined
and data transfer has dropped to about 20 gig a day combined
There are however over 50 ftp clients, could this be clogging up the server?

Any solutions would be greatly appreciated

 

 

 

 

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