If all you want is 2D fluid flow with points, than Sebastian Lague's talk is very practical for the frame-rates he hits:

https://www.youtube.com/watch?v=rSKMYc1CQHE

It should port over if you are not hitting super fine granularity, and the collision model for the sprites is simplified.

Some of the Babylon.js fluid examples still need a bug report:

https://doc.babylonjs.com/features/featuresDeepDive/particle...

Have a wonderful day =)