JCH Optimize just does the things that Google recommends.
Some of the things that Google recommends can be done with an extension (JCH Optimize, RokBooters, etc.). But there are other things that should be done on the server (mostly in the
.htaccess
file). For more details, please have a look at
this blog post.
Every website gets different scores on Google Page Speed. It depends on the server optimization, on the extensions that are being used, on the images that are being loaded on the page, etc.
You should really install and configure JCH Optimize and see what the scores with and without it are.
Here, have a look at
this video that I recorded for you. It shows the scores of our Royalty template with and without JCH Optimize.