I got my old test project and made a comparison.
HTML5
WebP Safari:
Basis Safari:
WebP Chrome:
Basis Chrome:
Build size:
Basis 58.6Mb
WebP 23.5Mb
Basis zip 18.9Mb
WebP zip 16.9Mb
Android
Device: Xiaomi Redmi Note 4
WebP:
Basis:
Build size:
Basis 20Mb
WebP 18Mb
iOS
Build size:
Basis 19.3Mb
WebP 17.3Mb
*Similar to webp, the first time is always much slower. But I didn’t make screenshots it this time.
**I’m going to improve the old test project and repeat all the measurements