perf(md-select): repaint on scroll (Google Chrome)

[Ploppy3]

Bug, feature request, or proposal:

Bug

What is the expected behavior?

It should not repaint on scroll

What is the current behavior?

It repaints on scroll

What are the steps to reproduce?

https://stackblitz.com/edit/angular-material2-issue-vyd5mg

What is the use-case or motivation for changing an existing behavior?

Performance matters.

Which versions of Angular, Material, OS, TypeScript, browsers are affected?

Material 2.0.0-beta.12

[maxime1992]

Shouldn't be that done nearly everywhere?

For example this behaviour is still present on table, which is not great when there's quite some lines.

I know that we can use the pagination but still, feels like it might be faster for tables with 50 or 100 items

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