My WordPress website runs slow with Cloudflare

I am new to Cloudflare and today I integrated it for my WordPress website. Unfortunately website loading has slowed down instead of speeding up. It takes several seconds until the website has loaded. Could you please tell me why and how I can solve this problem?

Screenshot:

Do you have the previous GTmetrix result?

Kindly share the link of the result before and after.

I don’t have a screenshot. Before it was Grade D or E.

Now you get C. Definitely there are some improvements right?

Loading time of the website slowed down afte rhaving integrated Cloudeflare. When you load the website you will see it takes around 3 seconds. My goal is < 1 second.