Woocommerce checkout page slow when turn on CF proxy


I’m having problems with the checkout page loading speed (Woocommerce).

My site address: simtlv.co.il
When CF proxy is turned off, download speed: 3s
When CF proxy is enabled, download speed: 6s

I used Cloudflare APO but it didn’t work.

Please provide a solution to help me handle this problem.
Thank you!