Performance problem with many elements in the page

[felixzapata]

Description

The iron-autogrow-textarea element causes the page to have a low performance in a scenario with many components in the same page.

When you type on the input, there is a big delay for the user.

Expected outcome

No delay when the user is typing on the input.

Actual outcome

There is a big delay for the user and if you get a profile from the performance tab.

Live Demo

Steps to reproduce

Browsers Affected

Only tested with Crome:

• Chrome
• Firefox
• Safari 9
• Safari 8
• Safari 7
• Edge
• IE 11
• IE 10