What resources are relevant for site speed analysis and what points should not be paid attention to?

Question

PHP

I tried a couple of resources, but they seemed very weak to me, and they write nonsense in the end. Who Uses Kiki? And the next question. There are very strange points on compressing js and css files in gzip to cut 12 kb, does that make sense? I also worry that such sites ask to shorten the bootstrap code both css and js, is it worth paying such attention or how can I get around this moment (I would like to raise my sites to a score of more than 85 out of 100. Not everything can be explained to the client)? And also image optimization... I'm already trying to use the resolution at the right size, and he offers me to reap them by 94 percent, what?

Answer 1

https://gtmetrix.com/ + page load monitor built into the browser.
bootstrap.css drags the entire framework in its file, if your page uses, for example, only grid, then from the point of view of the optimizer, the rest of the code is superfluous and it is not needed for this page.
The same goes for style.css and js . After development is complete, they should be minified ( grunt or manually). This will also increase.
Images can be easily compressed up to 75% JPG quality, if they do not represent artistic value, the difference is minimal.
gzip is the server's ability to provide an answer to your request in an archive - will this give a tangible effect - you need to try and see

Answer 2

попробуй это www.website-performance.org

Answer 3

Сжатие изображений это не разрешение, а вес. Это можно делать в фотошопе при сохранении для веб, там есть ползунок качество.