[wp-trac] [WordPress Trac] #40330: Reconsider the usage of infinite scrolling across the admin

[WordPress Trac]

#40330: Reconsider the usage of infinite scrolling across the admin
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 Reporter:  afercia         |       Owner:
     Type:  defect (bug)    |      Status:  new
 Priority:  normal          |   Milestone:  Awaiting Review
Component:  Administration  |     Version:
 Severity:  normal          |  Resolution:
 Keywords:  a11y-task       |     Focuses:  ui, accessibility, javascript
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Comment (by afercia):

 About performance, I'm not familiar with profiling tools so anyone with
 better skills than me is greatly welcome to help measuring memory
 footprint issues. Checking the data reported by the Activity Monitor on my
 operating system I've noticed the browser's memory usage can easily go way
 higher than 1.5 GB after scrolling for a while in the Theme Installer
 screen. This is on a modern, powerful macbook pro. I can't imagine what
 happens on less powerful hardware or mobile devices. Not a surprise that,
 on mobile devices, sometimes browsers simply crash, as reported in #28927.

 Worth reminding the Theme installer screen loads hundreds of big images,
 often 1200 by 900 pixels images. Also, unfortunately some themes use a
 non-optimized `screenshot.png` image which in some cases weights more than
 2 MB. The theme installer screen then displays these images in an area of
 about 380 pixels, depending on the display's size, so I'd say loading such
 big images is highly inefficient. Ideally, the theme submission process
 should check for non-optimized images, or require an additional, smaller,
 image with a file size limit. Maybe consider alternative image sources and
 srcset and sizes, by the way these should be generated on the .org side.

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Ticket URL: <https://core.trac.wordpress.org/ticket/40330#comment:1>
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