How to optimize images and scripts on a wordpress site?

Question

Search Engine Optimization

Good day wordpress developers! There is a RIO site that has a pagespeed optimization of 53/100 on the main page, which is very low, I would like to at least get out of the red zone. To do this, of course, you need to correct at least important errors (although you yourself see everything), these are:
1. Optimize images --> installed the WP Smush plugin, it seemed to optimize all images in media files, but there was a problem, for example, in a portfolio, not thumbnails of images are displayed there, but native thumbnails, and pagespeed wants me to cut them if I If I do this, then in the portfolio itself there will be a small picture inside, a similar situation with the "last in the blog" block, the latest entries from the blog are immediately displayed, but the pictures are not displayed in thumbnails, but in native pictures inserted into the article and reduced for display in this block, I hope you understand what I mean. Oh yeah, also this page was created with visual composer, if that helps.
2. What to do with scripts and css blocking the display at the top of the page, put plugins like: autoptimize or speed boost pack, or the same W3 Total Cache and after enabling some parameters I got + on pagespeed, but the page could lose the slider or fall apart generally.
ps I will be grateful for any advice and materials in eliminating these problems, thank you very much!

Answer 1

There, each item has a link that explains what it is and how to fix it.
And optimized pictures and scripts can even be downloaded immediately from the same page.
If you can’t do it yourself, I think it would be better to hire a specialist.