Site eating up a lot of resources

[Mr Happy]

Tell your host to give you the logs of what is running when the server is "over usage". He should be ale to see what programs are causing the high cpu or if it is MySQl do a process list to see which Mysql commands are slowing the access down.

^^ Great idea. If you can't figure out the logs post them here and we'll find the problem.

[samipk]

i will ask my provider for the logs, but can anyone tell me the exact settings i need to do on wp super cache and is it heavy on resources?

P.S. should i use W3 Total Cache or WP Super Cache Plugin?