What is YSlow score in GTmetrix?

Related questions

1. What is Google Speed score?
2. Why do pages take so long to load?
3. How fast is Google server?
4. Does PageSpeed affect Google ranking?
5. What is a good PageSpeed score?
6. Do I need CDN?
7. Does Page Speed affect quality score?
8. What is a good page load time?
9. What is a good average page load time?
10. Is PageSpeed insights reliable?

Tags

1. #render
2. #browser
3. #based
4. #website
5. #front
6. #pagespeed
7. #grades
8. #optimized
9. #yslow
10. #gtmetrix
11. #possible
12. #following
13. #adherence
14. #analyzes
15. #rulesets
16. #means
17. #practices
18. #score