Connection to website using cloudflare is slow

my website: https://canhbuom-edu.vn/, It’s slow when using cloudflare, page load time is about 7 seconds, I tried setting DNS without cloudflare and it’s fast

Hello,

I am sorry to hear you are having speed issues. Right off the bat with us loading your zone we see this below.

As you can see most of your assests are showing as DYNAMIC which means they are not being cached. They are all being requested from the origin.

I would work to setup some cache rules to cache content on your zone. So that you can help reduce the amount of requests to your origin. Will also come at a smaller latency with them living in Cloudflare cache.