Techniques for Maximizing WordPress Sites to 80-90 in Google PageSpeed ​​Insights - How?

Question

Server optimization

Recently, at work, a bunch of sites come across on paid advanced themes with WPBakery Page Builder and WooCommerce on board - and all this slows down like hell , and the authorities demand indicators of 70-80-90 in PageSpeed ​​Insights!
For simple sites, I used the following approach:
1) I chose a more or less nimble virtual hosting on SSD
2) Installed and configured WP Super Cache
3) Installed and configured Autooptimize
4) Optimized the graphics of EWWW Image Optimizer
and managed to get to the scores of 65-70-80 , but what about heavy topics?
What steps are you taking to speed up your WordPress sites? What do you use: what plugins, technologies, approaches?

Answer 1

Google writes what exactly is the problem, doesn't it?
At one time I also dealt with IM, written partly in the constructor, but I overclocked it based on the site loading speed, and not Google pagespeed indicators.
Reached 300ms site load and calmed down. I cleaned the databases from garbage, at some point I remember even going through the entire css file of the designer and deleting unused styles (here you can look What to do with a large css file? ).
So you are digging in the right direction, a good cache plugin and fast hosting - the most important thing is to optimize the images and optimize the site files (for example, combine css files into one file)

Answer 2

paid heavy themes with WPBakery Page Builder and with WooCommerce on board - and all this slows down like hell

This will slow you down like hell. Try W3 Total Cache with Fast Velocity Minify. The second plugin can optimize purely for PageSpeed ​​Insights, so that there is something to show to the authorities. But keep in mind that you can easily re-optimize so that the site will float.
Usually the most points are given by a clear fit of the images to the dimensions. But in the case of the Visual Composer, you will have to manually edit the images for each page.
In general, it’s better not to sit down on monstrous themes and visual composers, this is a dead end. Choose a simple theme that does just what you need for a particular site and nothing else. For content, use the standard editor. If you need something that can't be done as standard functionality from the admin panel - make a template for the desired page + ACF (or rather ACF pro).
If the store is large, dynamic, with decent attendance. It is worth hiring an intelligent programmer and administrator. To properly configure VPS, move the database to a separate server, object caching, reverse proxy and other buzzwords.
It also makes sense to consider solutions for an online store other than WordPress.