MayhemYDG/4chan-x — comment on commit cd9cd822922b7a6489cf503cde26a8354fa1e00b
File:  line 0
By MayhemYDG:

That's not preloading, that's replacing thumbs with downscaled originals.

I don't know if your old computer will handle resizing 5000x5000 pictures.
Also,

>Firefox
>QUALITY downscaling