The test is i different sections, if it takes a lot of time to complete it might be one of the MySQL test that fails. One of the tests is horribly slow on MySQL 5.1 (10-20 times slower), we might remove that part in the next update.
More power for your system = faster rendering = faster load time. We get quite a few submissions from people using this plugin at the moment, test results varies from around 10 seconds to 125.
What we can see as well is that almost all PHP servers are running versions that are not the latest, some are even 3-5 years old and have a lot of security issues. This plugin can be used for more than just testing CPU.
The more CPU power the more power you have available to handle malicious robots etc etc, thottling means that everyone else that looks at your site when it's thottled will have slow load times. CPU power is very relevant to how your website performs, loads, renders etc etc.
Noone asks you to switch provider. You mention that you've got "good load times", that might be the case, but if the tests performed in the plugin was, let's say, 3 times faster, you would see a significant improvement in your load time. We do also mention that there are many other factors that affects your website, we only test how fast your PHP server can perform some math, string, ifelse etc tests and how fast your MySQL server can perform similar tests.