Google Chrome OS is always evolving. Sometimes your device might not have automatically updated and that could be causing performance issues.
How to Check and Update Google Chrome:
1) Open the Device Settings
2) At the bottom of the menu on the left hand side of the window, select "About Chrome OS"
3) On the right side of the window, click the button labeled "Check for updates"
4) Now your device will either process this request and state that the device IS up to date, or it will begin to download the newest version of Chrome OS. If it does need an update, once the download is complete it will prompt you to restart the device. Once the device has been restarted, the new updates should be fully functional!