Does not work on my site

@mariestorko,
As the name says, this plugin only minifies CSS and JavaScript. You can try one of my another plugin ‘WP Performance Score Booster‘ which supports compression.

You can share your site URL to look further.

Thank you for your answer! I installed and activated both plugins, but I cannot see any difference in performance and it still tells me to enable compression. My site is https://trombofilik.cz

This is link to my results from Google Speed Test:
https://developers.google.com/speed/pagespeed/insights/?url=http%3A%2F%2Ftrombofilik.cz%2F&tab=desktop

Do you know why I still get these results and what can I do with it? It would help me a lot.

@mariestorko,
WP Performance Score Booster plugin enables compression in WordPress site (by adding rules in .htaccess). I can see your site already loads compressed pages. See this compression checker result.

The suggestions Google PageSpeed provides to enable compression are related to external resources such as Facebook and Twitter API. See this screenshot: https://cloudup.com/cfamVllpNYR/f.

It may not be possible for my plugins to compress external sites contents – I am afraid.