Hi @fceriani,
the numbers of requests varies dependly of the browser used; it is normal?
Yes, all modern browsers are super smart and the number of initial requests will depend on many different factors. This is totally normal.
it seems I have a good TTFB, but the total load time is around 3 seconds. Can I improve it tweaking the settings with WP Cloudflare?
If you look at the waterfall chart (which you haven’t shared) will give you a much better understanding of the situation. But still looking at the data you have shared, here is my hypothesis:
1. Your site loading time is slow not because of TTFB but because you have a lot of reader blocking javascript in your website. Who are basically blocking the page rendering until the browser downloaded, parsed and executed all of those javascript.
2. So, to make your site faster, you need to cut down your javascript. There are a couple more things I can recommend you to try:
Use the Autoptimize plugin to optimize your CSS & JS files.
Enable Rocket Loader inside Cloudflare Dashboard and see if your site is still working fine as it should. Now run the tests again.