Hondata is a great example of using a laptop to tune a car. For those interested in buying parts like assembling a big lego, http://www.factoryfive.com/ is a good place to check out.
Not thinking too much about it, I used letsencrypt on my business site as soon as I read that google would be looking at TLS for SEO purposes. Sadly SEO seemed more important than speed if I was using both to judge if we use TLS or not. If the speed is an issue what does it matter if someone can't find the site?
hit a few keys and turn a few knobs and all of a sudden you're making 50 horsepower more, and living life in the no warranty danger zone. exciting!