Using the report

Browsers and Devices

Browsers and devices are carefully chosen to provide comprehensive coverage of end-user experience using major browser engines, high-end & low-end mobile devices, and multiple screen resolutions.

Test settings

Speedlab parallelly loads the page on real browsers and mobile devices from our data centers in Western Europe connected to high-speed cable networks.

Mobile score & Website score

Score for mobile website & desktop website is calculated based on performance across all browsers or devices. Score is generated on a scale of 0 to 100, where 0 is the worst, and 100 is the best possible score.

Metrics & definition

Speedlab uses navigation timing API which accurately measures time on browser to sequentially load the page. To know more about navigation timing API, click here.

Below are definitions of metrics and how they are calculated:

Page load time: Time taken from start till page is fully loaded. It is calculated as loadEventEnd - navigationStart.

Browser processing: Time take after browser starts processing page content till page is fully loaded. It is calculated as loadEventEnd - domLoading.

DNS: Time taken to lookup website domain. It is calculated as domainLookupEnd - domainLookupStart.

TCP: Time taken to establish a connection with server. It is calculated as connectEnd - connectStart.

TTFB: Time taken to receive the first response byte from server. It is calculated as responseStart - requestStart.

Response: Time taken to fully receive first reponse. It is calculated as responseEnd - responseStart.

DOM processing: Time taken after browser starts processing page content till page content is loaded. It is calculated as domComplete - domLoading.

Onload: Time taken by browser to execute javascript code after page content is fully loaded. It is calculated as loadEventEnd - loadEventStart.