Slow loading images on mobile

Hello,

We have an issue where our images load slow in the slider.

See this video for explanation:

https://drive.google.com/file/d/1Bypzz6vza0Bu2veDIJjyYYh4963M5XMX/view?usp=sharing

How do we fix this?

We use Imagify + WPRocket on the site.

Best regards