I noticed when Octane Sun shines noise goes away in seconds.
But mesh emitters or other small octane lights take a while to clear. Please add a button like fake shadows called, for example, fake lights where it will get rid of noise as quick Daylight system even if it is not 100% real. Would be good for animations.
Same for indirect light like fake indirect light that after couple seconds it detects general color and light levels and averages it making it noise free.
Just an idea
Thanks