Why are Angular date pickers so slow?

Question

Why do Angular JS date pickers use so much CPU? When you have a few of them on a page they significantly slow a site down.

Is there any way to mitigate this?

For example, the official Angular for Bootstrap directive:

And the mobinni/material-date-picker:

Answer 1

Since I couldn't find an efficient AngularJS datepicker I switched to using a standalone one that doesn't block the AngularJS digest: https://github.com/dbushell/Pikaday. My application is now much faster.

As for the suggestions in the comments, I don't see how a wrapper would make anything faster (more code = less speed), and I can't change the code of an external component safely.

I guess maybe people just write components badly. Or perhaps this type of frustration is inherent in AngularJS and why people are switching to React.