Low performance on custom emoji images (lemmy.dbzer0.com)

submitted 4 months ago by Redjard@lemmy.dbzer0.com to c/summit@lemmy.world

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Take this comment as an example: https://lemmy.dbzer0.com/comment/20455448

There are a few images with notable resolution (500×500) in that vote comment, that are shown at very small size. Whenever they come into view, the fps of the entire app drops notably for me, down to perhaps the tens. I've seen it go even lower on other votes with more emoji.

My phone is quite powerful, and browsers for example can display similar cases fluently even on much worse hardware.

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[-] idunnololz@lemmy.world 12 points 4 months ago

Easy fix. Will release an update in a bit. Thanks for the report.

[-] Redjard@lemmy.dbzer0.com 6 points 4 months ago

Fixed, thx

[-] limerod@reddthat.com 3 points 4 months ago

I cannot reproduce. The fps does drop to 40-50 once a while but nothing unusual.

The app is able to consistently maintain 60fps in my case.

[-] idunnololz@lemmy.world 4 points 4 months ago

Here, try this link WARNING your device may lag a lot: https://lemmy.world/post/34182614.

[-] limerod@reddthat.com 2 points 4 months ago

I saw your comment after updating the app. It won't be noticeable now after the update if it could be reproduced on my end.

[-] Coelacanth@feddit.nu 2 points 4 months ago

My phone at least does indeed lag a lot on that comment, if that data point helps you.

[-] Redjard@lemmy.dbzer0.com 3 points 4 months ago

It might be me having an unusually-high-dpi screen making it worse. Goes from consistently 120 to the tens.
How powerful is your phone?

[-] limerod@reddthat.com 1 points 4 months ago

Its a midrange dimensity 7050 smartphone with 12gb of RAM.

[-] Redjard@lemmy.dbzer0.com 1 points 4 months ago

snap 888 for me, so 1.3x cpu and 2.6x gpu according to some random benchmark site. Older upper-range phone, also 12GB ram.

Must be my resolution/screen density then. My display width is 1644, so 2.3x the pixels of a 1080p screen. The android "density" value is decreased to 525, the 1080p equivalent is 345. That makes stuff a lot smaller on my display. I think the issue was with the images being scaled down a lot, more so than their actual size, since like ten 500² images should be no issue at all.

It's probably the dpi decrease rendering the images even smaller making it worse in my case, tho the resolution prolly aint helpin.

[-] limerod@reddthat.com 1 points 4 months ago

My phone's resolution is 2412×1080. Devcheck says 480dpi. I think there could be some other issue.

[-] Redjard@lemmy.dbzer0.com 1 points 4 months ago

That checks out, 1080p is normal, and 480dpi would be 730 at my resolution, so my 525 makes the images 40% smaller rendering over a similar number of pixels (10% more).
I guess this was about the scale then, how little of the total display the image was taking up.

this post was submitted on 10 Aug 2025

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