Fixing GPU memory bottleneck with GPU optimised Textures.

the HTML5 backend workflow picks up textures as PNG, JPG or HDR.

However these textures are not optimised for GPUs. Having optimised GPU textures can really improve real-time performances and GPU available memory.
It would be ideal to have ASTC format added.
https://www.khronos.org/blog/create-astc-textures-faster-with-the-new-astcenc-2.0-open-source-compression-tool

ASTC Textures can be loaded as javascript Blob objects and generated using the appropriate tool:

ASTC:
https://github.com/ARM-software/astc-encoder

Example :
how to load AST textures in HTML5/WebGL:

var ext = gl.getExtension('WEBGL_compressed_texture_astc');

var texture = gl.createTexture();
gl.bindTexture(gl.TEXTURE_2D, texture);

gl.compressedTexImage2D(gl.TEXTURE_2D, 0, ext.COMPRESSED_RGBA_ASTC_12x12_KHR, 512, 512, 0, textureData);