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That’s the real problem. The app he is using reduces the image to optimize memory usage, but if the image has too many pixels in either direction, it ends up decimating too much.
I ran into that issue with one of the Lemmy clients when I was trying them out, but can’t remember which one it was. If I remember correctly, it should be something that you can turn off, but it can drastically slow down how long it takes to display some images.

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Ghoelian@lemmy.dbzer0.com ⁨2⁩ ⁨days⁩ ago
In Thunder, the preview is super blurry and unreadable, but once opened it looks fine.

I’m pretty sure the reddit app I used to use (Relay) had the same issue.

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Mustard@lemmy.blahaj.zone ⁨2⁩ ⁨days⁩ ago
Oh interesting, that might be it. I’m using Sync.

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- Test_Tickles@lemmy.world ⁨2⁩ ⁨days⁩ ago
  I was thinking it was sync, but I didn’t want to call them out if I was wrong…
  I suspect that it was originally written for devices with much less power and much less memory. Also reddit had upper limits on image size. So, Lemmy’s yolo way of dealing with images is coming up against sync’s attempts to be able to run nicely on the worst devices.
  
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