The first part of the Load Times page is the Timeline graph, which plots the average length of time it takes for three RUM metrics – average time to load, average time to interactive, and average time to first byte (TTFB) – over calendar time. The time axis units depend on the current time filter setting. For example, with the time set to 1 day, the time axis shows units of hours:
The metrics used are
|Time to page load||The time between when the browser sends its request for the web page assets (that is, after the DNS lookups are finished and the TCP connection has been established) until the load event occurs.|
loadEventStart - requestStart
|Time to interactive||The time between when the browser sends its request for the web page assets (that is, after the DNS lookups are finished and the TCP connection has been established) until the page becomes responsive to user interactions.|
domInteractive - requestStart
|Time to first byte (TTFB)||The time between when the client makes an HTTP request and when it receives the first byte of the response.|
We consider 98th percentile data (for each country) based on page load time.
If you want to see all of the raw Navigation Timing information, you can request log delivery with this information included along with the default set of log fields. For assistance with enabling the log delivery service, please contact Support.
If you hover the mouse pointer over a point on the plot, the average values of these metrics are displayed in a box alongside the mouse pointer, with a granularity that depends on the time filter settings.
You can also drag either the left or right side of the zoom control just beneath the timeline to focus on a narrower range of times.
Below and to the left is the Location display. You can hover the mouse pointer over a country on the map to display numeric data for that particular country:
To the right is the Top Countries donut chart. You can hover the mouse pointer over a country on the chart to display numeric data for that particular country: