Hi. I've tried Ocean WP and Generate Press, I've never tried Astra. I've used Elementor PRO and Thrive Architect, but I'm obsessed with the SEO Friendly and Web Speed theme. What combination of theme and visual editor do you recommend to create web pages that have better results in Google PageSpeed?
Well, that is a good obsession to have.
Really though these differences are not THAT significant because all the tools you are listing are really good to begin with.
Either way you are going to have to use a caching plugin to optimize your website.