Alas, this is both a downside and an upside of Selenium. It's rather slow because it does need to spin up a Firefox instance, but it is very user-friendly and easy to learn because you can see exactly where you are at just by looking at the web browser.

You can run headless Selenium, and speed it up by using a static Firefox instance, but even then it'll be maybe 2-3x slower than some of the others.

The only reason this is (in my opinion), better than other solutions is because you can see the physical webpage it's loading, and for the sheer ease of use that this has. You don't even really need any coding experience to get a simple test running.