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The iPad 3 was slow to begin with.

As for Safari, complex JavaScript and media heavy websites are part of the issue. Even if Firefox was supported, it still wouldn't work well. Only reason Puffin works is because it's a proxy that does the heavy lifting server-side. On mostly text sites (e.g. fanfiction), Safari still works just fine on the iPad 3.

Things like reading sideloaded ebooks (non-DRM epub or mobi), comics (non-DRM cbz or cbr) and pdf should continue working forever with standalone reading apps that don't rely on servers. Same for watching offline/sideloaded videos.

At the very least, one can use it as a digital picture frame.
 
The iPad 3 was slow to begin with.

As for Safari, complex JavaScript and media heavy websites are part of the issue. Even if Firefox was supported, it still wouldn't work well. Only reason Puffin works is because it's a proxy that does the heavy lifting server-side. On mostly text sites (e.g. fanfiction), Safari still works just fine on the iPad 3.

Things like reading sideloaded ebooks (non-DRM epub or mobi), comics (non-DRM cbz or cbr) and pdf should continue working forever with standalone reading apps that don't rely on servers. Same for watching offline/sideloaded videos.

At the very least, one can use it as a digital picture frame.

Digital picture frame... I chuckled a bit. I actually brought a digital picture frame. This frame allows me upload picture from WeChat everywhere.

The iPad 3 was my first iPad. I was all excited for the Retina display. It worked well until iOS 7, then everything falls apart. I was one of the pissed off owners when Apple annouced iPad 4 half years later.

In someway, iPad 3 was test product for Apple and iPad 4 is should be the first iPad with Retina display that works reasonably well. To this day, iPad 4 still running just fine (Under iOS 9, didn’t not want upgdate to iOS 4).

I don’t have iPad 3 anymore, I sold it long time ago. But I have iPad mini first generation. That iPad mini had A5 processor which is same processor found on iPad 3 (A5X is just A5 with triple core graphics). And iPad mini struggle a lot even with iOS 8. I had no choice but downgrade this thing to iOS 7. My mother is using it for video watching, iOS 7 runs reasonablely OK.
 
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