Search for a city:
1. Search for a city (Example: "Francisco"). Notice that the filtering happens immediately as you type.
2. Load the core-js es.string.split polyfill by hitting this button
3. Search for the same city (Example "Francisco"). Notice that their is a lag when typing and the filtering is much slower.
4. You will need to open this page in a new tab for each test after loading core-js.