Is there any service to rent cloud CPU power to increase my mac power? I'd like to know if there is any service to easily rent CPU power on OSX to speed up my mac. It would be really nice to be able to do something like this, but with OSX.

Is there such a service?
I've ever used them, but Macminicolo might be of interest to you. It won't speed up your subjective Mac user experience, but it can provide computational and server-related services that you can offload.