General
Our snippet settings are preset to track everything important, but you can turn something on or off. When you change the snippet settings, you also see how many bytes are added to your snippet. So you have control over the size of the snippet.
Snippet version
New sites should start at the newest version, which is V4.
What you want to track
If you have an enterprise subscription, you can also use JavaScript warning and error logging.
Single Page Application (SPA):
If your site is a have a Progressive Web App or Single Page Application in general, we will use the new soft-navigation timing entry (Chrome only).
If you are running an SPA and want to track TTFB as well, we advice you to continue reading over at our SPA & soft-navs section.