Page speed from Grade A to Grade D with Fastest Cache and Bunny CDN

I wanted to get better performance with WP Fastest Cache. I saw in one of the options that the plugin can integrate with Bunny CDN, so I made an account for that.

Now it is running for 2 days and all my performance has become dramatically bad.

Without WP Fastest Cache and Bunny CDN, GTMetrix grade:
A / 90% performance / 91% structure / LCP 1.4s / TBT 18ms / CLS 0.08

With plugin and CDN enabled:
D / 46% performance / 89% structure / LCP 2.6s / TBT 579ms / CLS 0.21

What do I do wrong?

The page I need help with: [log in to see the link]