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corona-warn-app
Slow FAQ article display on mobile
Where to find the issue
https://www.coronawarn.app/en/faq/results FAQ detail page
Describe the issue
Displaying an FAQ article on a mobile device is slow. Typically it takes 8 seconds.
Steps to reproduce
Manual measurements
In Google Chrome on mobile Android device, bookmark the following URLs:
| Label | URL |
|---|---|
| FAQ_1 | https://www.coronawarn.app/en/faq/#further_details |
| FAQ_2 | https://www.coronawarn.app/en/faq/results/#further_details |
| Blog_1 | https://www.coronawarn.app/en/blog/2021-08-05-statistictiles/ |
Load times in seconds in Google Chrome. First figure is manually measured. Figure in brackets ( ) is from Google Chrome developer, Network tab "Finish" duration:
| URL | Android 12 | Windows 11 |
|---|---|---|
| FAQ_1 | 8 (6.35) | 3 (1.67) |
| FAQ_2 | 7 (5.85) | 3 (1.88) |
| Blog_1 | 2 (1.42) | < 1 (0.545) |
Android and Windows connected to same WLAN. Remote connect to Android according to https://developer.chrome.com/docs/devtools/remote-debugging/ In Android 12 with reload icon. In Windows 11 with Ctrl-F5 to reload page without cache.
Lighthouse measurements
In Google Chrome Incognito window, open https://www.coronawarn.app/en/faq/results Press F12 Select Lighthouse Select Navigation / Mobile / Performance Click "Analyze page load" Note Performance score 50 First Contentful Paint 8.2 s Time to Interactive 9.3 s
Expectation
FAQ display in less than 2 seconds on real mobile device. Lighthouse Time to Interactive on simulated mobile device also less than 2 seconds.
Internal Tracking ID: EXPOSUREAPP-13694
- https://github.com/corona-warn-app/cwa-documentation/issues/912 is related.
Thanks for your report @MikeMcC399. We have created an internal ticket for it and will raise this topic internally. Internal Tracking ID: EXPOSUREAPP-13694
Corona-Warn-App Open Source Team
