Why are websites so poor in terms of transition & animation compared to native apps?

1. Do animations slow down website?
2. What is website transition?

Do animations slow down website?

Too much motion can slow down the loading of a web page. Too many animations prevent visitors from knowing which parts of the page to focus on. Website animation doesn't always translate well to mobile, which leads to poor experiences.

What is website transition?

Website Transitions are the animated changes between two pages or views. Transitions are developed through any kind of design element and can obtain more than what meets the eye.