Joomla site extremely slow

[Stingraynut]

Someone else has managed to discover " there's a process on the server that's using up all available RAM & a lot of the CPU. This shouldn't be difficult to fix, but to do so I need full access to the server " he says "if you can request SSH access from the host the fix should be pretty quick"
At this stage I don't know how he discovered this, but sounds like he's found the problem. I also don't know why SSH access will enable a fix- I'm out of my depth on this one! I thought SSH was just a secure connection to avoid eavesdropping.