pronto pronto - wasm and webgl1 for all browser without asm

How to tune my build parameters that all browsers edge, ff, chrome and safari are getting a Wasm opengl1 context?

I have
PlayerSettings.WebGL.linkerTarget = WebGLLinkerTarget.Wasm;

but also asm is build

PlayerSettings.WebGL.emscriptenArgs += "-s WASM = 1";

Best is to have the args like we compile the stuff from c++11 by our self
emscriptenArgs -s WASM = 1 -s LEGACY_GL_EMULATION=1


I observed fallbacks that are ultra slow and unsufficient to asm, when wasm weggl1 is possible.
I.e. old Macs or computers with banned grafic cards (gtx 660) however alot.
I want to make a build with maximal compatibility without fancy experiences without compromising in wasm.

Anyone?

 

Somehow Edge Browser prefere asm builds. I moved from 2018 to 2019. And the problem is how to make a wasm build that support edge and all webgl1 users as well as the latest users with the latest hardware? Is there somehow a strategy for a build that covers all major platforms. Asm i think will never be a option. There are multiple execution timeout warnings cause its too slow.
So what settings covers all platform in the best possible way?