Speed and performance
To check the speed of a website there are several online tools. The first is Google PageSpeed , which has recently been updated and offers many details; the second that I prefer is GTmetrix especially for the "Waterfall" section section that reports the loading time of each resource of a page.
From here you can check which resources take the longest to load the page and then optimize them.
Also check that you have enabled a browser Caching system on Wordpress. I am very purchase shareholder database happy with the WP Fastest Cache plugin , the installation is very simple and it is not too heavy, unlike other plugins.
If you want to dive deeper into the topic, you can take a look at SEMrush's Website Performance Research (2018) which highlights the most common issues that significantly slow down website performance.
To check if your images are SEO optimized you need to open your media library and check if the Title and Alt Text (alt) fields are filled in and optimized.
Wordpress Image SEO Optimization
Also check that the name of the image uploaded to the server is optimized. Example:
DC20391.jpg --> it is not optimized
assistenza-informatica-firenze.jpg --> is optimized for SEO
Images should also be treated to get a better page loading. If images of 1mb or worse are loaded, you risk slowing down the page a lot. To solve this problem you can download the plugin WP SMUSH .