Website with +200 Visitors Per Hour or more

[Lock Down]

With cloud linux you will lose half your members. I get page not available at least 10 times a day on low volume sites. No one will put up with that on a high volume sites.

Again it may be just some simple tuning. You may be allowing each IP to connect 20 times or more eating up your resources.

[FileStorageHouse]

Thanks guys. i will take all of these into consideration

[tut2tut]

try www.guardhosts.com they are really good service + support

[BlaZe]

Just disable all the plugins/hooks.

Then see whats the load.

Enable the plugins one by one and monitor the load. See which particular plugin/hook causes the increase in load.

If the disabling plugins doesn't help, then optimize (tune) MySQL (Please Google for this)

If it still doesn't help, then hire a server expert (go for some reputed companies) to optimize your server.

Or else, get a dedicated server with high-end hardware. That's your last possible option.

[JoomlaZ]

@ OP, move to a vps under knownsrv. I have sites which having daily 6000 uv and all fine with them