Blur effect and animation

[GianlucaAntolini]

Hi, great work, really!!
Just two questions: I've been going through the code and wanted to ask how do you change the blur effect? I'm not talking about the ultraThinMaterial which is fine but I think the issue comes with the opacity, that makes the blur less effective.
Also it seems like the blur effect appears with a delay (for example if you scroll very fast at the start). How can I change that?
Thanks.