Loading time and jerky Animation

read-only link: Webflow - Animation test

webflow link: Webflow - Animation test

Hello guys,
I am trying to create an animation like this website by following Timothy Rick tutorial and I found two problems.

Firstly, it is the loading time. It still take so long to load even though I convert my jpeg to webp format. Do I need to add some code or change something? Any advices on what is the best way to optimize website speed would be really appreciated.

Secondly, by comparing, you can see that the original website animation is so smooth but for me it is kind of jerky animation. I have tried adjusting the animation curve many times but still couldn’t match.

Thank you so much!