I’m sorry to hear that you’re experiencing issues with your website’s speed after installing WP Rocket.
I have tested your site on GTMatrix and here is the result: https://gtmetrix.com/reports/www.trendmore.com.tr/B3Ghm0lo/ it’s really not good.
We would recommend using the Theme Speed Optimization Wizard as well to speed up your site. We have the detailed documentation on Speed up the site, please refer to our theme documentation here: https://www.portotheme.com/wordpress/porto/documentation/?s=how+to+speed+up+the+site
And for the shopping cart icon, as you wrote that you are using the WP Rocket cache plugin, so make sure to remove the cart, checkout, and account pages being cached from WP Rocket >> Settings >> Advanced Rules.
Hope this will resolve your issue.