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[SECTION] 9<br />
SITUATIONAL<br />
PERFORMANCE<br />
The metrics presented here are based on data collected through<br />
Akamai’s Real User Monitoring (rum) capabilities, which take<br />
passive performance measurements from actual users of a web<br />
experience in order to provide insight into performance across devices<br />
and networks. rum is a complementary capability to synthetic testing,<br />
and the two can and should be used together to gain a comprehensive<br />
picture of user experiences. Note that no personally identifiable<br />
information (“pii”) is used to generate this data.<br />
Figure 42 shows average page load times for users on both broadband and<br />
mobile connections based on rum data collected by Akamai during the<br />
first quarter of 2016. The underlying data was collected using navigation<br />
timing 44 (or “navtiming”), which allows JavaScript to collect page load<br />
time information directly from the user agent (browser) through an api.<br />
Navtiming is supported by most — but not all — of the browsers currently<br />
in use. 45 In particular, navtiming is not supported by Safari prior to version<br />
8 on os x and version 9.0 on iOS, Android before version 4.0, Internet<br />
Explorer before version 9, or any version of the Opera Mini browser, so<br />
data from these devices will not be included below.<br />
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