https://bugzilla.wikimedia.org/show_bug.cgi?id=67359
Bug ID: 67359
Summary: MultimediaViewer: In overlay viewer, shrinking window
makes 4 requests for large images
Product: MediaWiki extensions
Version: unspecified
Hardware: All
OS: All
Status: NEW
Keywords: performance
Severity: normal
Priority: Unprioritized
Component: MultimediaViewer
Assignee: [email protected]
Reporter: [email protected]
CC: [email protected], [email protected],
[email protected], [email protected]
Web browser: ---
Mobile Platform: ---
After having already loaded the full screen viewer (not the HTML 5 OS-level
full screen, but just page filling overlay), shrinking the browser window fires
off 4 http requests. Say the current window size requested 1280px width and I
narrow the window to about 800px wide
* Current image at 1024px (XHR)
* Current image at 1024px (Image)
* Some image I previously viewed at 1024px (XHR)
* Some image I previously viewed at 1024px (Image)
Imho shrinking the window shouldn't fire off any http requests. The browser is
good enough at scaling (especially with HiDPI in mind). Certainly not worth it
when just adjusting the screen a little. But either way, if you really want to,
just fetch one :)
Steps:
0. In Chrome (35; stable), 1440x900px Retina display, browser window maximised.
1. Open https://commons.wikimedia.org/wiki/Category:Carla_Bruni
2. Click "Nicolas Sarkozy and Carla (..) Obama.jpg".
3. Close it, and click "Michelle (..) G20 leaders tour.jpg".
4. Open Dev Tools (pop out), focus Network, clear current log.
5. Resize window to about half the width
Expected:
No network activity
Actual:
1)
1280px-Michelle_Obama_and_the_spouses_of_the_G20_leaders.jpg
upload.wikimedia.org/wikipedia/commons
GET 200 image/jpeg 185 KB 63 ms
OK XHR 185 KB 16 ms
Request:
- Accept:*/*
- Cookie:
Response:
- Age:14399
2)
1280px-Michelle_Obama_and_the_spouses_of_the_G20_leaders.jpg
upload.wikimedia.org/wikipedia/commons
GET 200 image/jpeg 185 KB 61 ms
OK Images 185 KB 11 ms
Request:
- Accept:image/webp,*/*;q=0.8
- Cookie:GeoIP=*******::*******:v4
Response:
- Age:14400
3)
1280px-Nicolas_Sarkozy_and_Carla_Bruni_welcomes_by_Michelle_and_Barack_Obama.jpg
upload.wikimedia.org/wikipedia/commons
GET 200 image/jpeg 191 KB 56 ms
OK XHR 191 KB 14 ms
Request:
- Accept:*/*
- Cookie:
Response:
- Age:13063
4)
1280px-Nicolas_Sarkozy_and_Carla_Bruni_welcomes_by_Michelle_and_Barack_Obama.jpg
upload.wikimedia.org/wikipedia/commons
GET 200 image/jpeg 191 KB 40 ms
OK Images 191 KB 11 ms
Request:
- Accept:image/webp,*/*;q=0.8
- Cookie:GeoIP=*******::*******:v4
Response:
- Age:13063
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