Dedicated Server really slow today

Today the server im running has been extremely slow and keeps dropping connection, i run a gaming platform off this and everyone joining has extremely high ping. I haven't amended anything its just started off its own accord. Its making applications freeze, has anyone else noticed a drop in performance today?

This might be the case :-
Lots of traffic
Extra large images (and complex file format)
Code density
Text graphics
Too many file requests (RTTs)
Too many plugins
Unnecessary redirects
An outdated CMS

Hope this information is helpful to you.