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Switching from PNG to basis for my game (currently with a pretty minimal set of textures) was like a 50% reduction in load times with no other changes.

Note that I'm not storing assets at rest in a ZIP file because there's no reason to. If I was doing that it might close the gap some.

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Yes I agree but the PNG compresion size is so great ! The Textures in total reduce enormously my game file size. By 15 times : so good. And because it is small the web download is VERY quick. Very.... So in a way I loose a bit on decompresing textures time, BUT a gain a lot od seconds in dowloading reduced textures files.

How many times do you decompress the textures, and how many times do you download them?

Only once :

- Step 1: download zip file containing my XML point file and my 90 PNG texture files.

- Step 2: open zip file and dezip in 91 filed

- Step 3: run 3D games with all the 91 Assets. The (small) game engine reads each 90 PNG files and - of xccourse- transform each one in a GPU compatible texture.

All zip takes about 6 seconds. Not so bad

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