Avg. Domain search time (sec). The time spent in DNS lookup for the page is shown here. If your average is over 0.25 seconds, take action. Avg. Server connection time (sec). This shows how much time the average user spends connecting to your server. Any time over 0.25 seconds is cause for concern. Avg. Server response time (sec). Shadow Making Service This metric shows the average response time to a user request. Any time over 0.25 seconds should be investigated. Avg. Page download time (sec). This shows the average time to download your page. A time greater than 2 seconds means there is room for improvement.
Full definitions and details can be found in Google's help docs, including a diagram of Page Sync components. The "Page Timings" report by browser is useful to start your analysis. You can access this report via the "View Full Report" link in the "Overview" report. Shadow Making Service Access the "Page Timings" report via the "View Full Report" link in the "Overview" report. Access the "Page Timings" report via the "View Full Report" link in the "Overview" report. Select the "Data" view and the secondary dimension by "device category" to see a report similar to the one I'm going to comment on. Select the "Data" view and the secondary dimension by "Device category".
Select the "Data" view and the secondary dimension by "Device category". Click on the image to enlarge. I like to sort by “Avg. Page Load Time (sec)” in descending order to identify the highest page load times by browser and device category. Shadow Making Service Sort by "Avg. Page Load Time (sec) in descending order to identify the highest page load times. Sort by "Avg. Page Load Time (sec) in descending order to identify the highest page load times. Click image to enlarge.