There are several good browser testing sites on the Internet. Here are just a few that we find most useful. We're always open for tips on new good ones.
These tests are not intended to be used as oracles, but rather as a way to check your setup and verify that your changes are applied.
Performance tests can be done with Octane. It needs to be launched with other applications closed and with no other activity. It is recommended to run the test multiple times and then calculate the average.