The CPU should be okay, but there might be other things causing it to slow down. Here are few things I would recommend you checking (in no particular order):
If you give us some of the outputs (in pastebin, feel free to blank out IP addresses or anything you think may disclose your personal information) and maybe we can identify things a bit better.
Another recommendation for namecheap.com -- thanks /u/lesigh for weighting in!
On another note, though, it seems like you are getting hosted (website) with your domain registrar. From my experience, I'd say the hosting service provided by most registrar are sub-par at best, and down right nasty for the most part. If you have the spare budget, you may wish to invest in an actual hosting company on top of your registrar. On that note, you should also NOT go with hosting companies as your domain registration provider. There had been a lot of horror stories where people get locked into a shitty hosting provider because hosting provider refuse to transfer the domain out to another registrar. Alternatively, if bandwidth at home isn't an issue, you can install something like xampp to run the website at your home, as well.
Hope this was slight bit helpful at the least! :)