What's the difference on check box denoise final pass?

[cgrant3d_cg]

As the title mentions, What's the difference on check box denoise final pass?
If you are working on the scene, the denoiser will constantly refine as time passes, but while doing final frame rendering, this meant that it would process faster?? Like in one animation?
Or is the difference not significant?

Also disabling Light Cahce it means that the GI is processed is only brute force.

[vladimir.nedev]

As the title mentions, What's the difference on check box denoise final pass?

It means that if you have 100 AA samples per frame, the denoiser will be calculated only on the final sample.
You lose the preview of the denoised image, but save some time.

Also disabling Light Cahce it means that the GI is processed is only brute force.

Yes.

Greetings,
Vladimir Nedev