Here’s a fix for the expensive blur that could not be disabled:
SSAO2 is under the radar for an overhaul: Improve SSAO / Mirror reflections / Refractions · Issue #12630 · BabylonJS/Babylon.js · GitHub
I can’t help much more because I don’t know the algorithm and it is a bit complex. Maybe @CraigFeldspar may be able to help if he is around. There has been some discussing about SSAO2 in Ssao 2 has different results each time i add it to the scene ( video showing it ).