Would you notice? Maybe, just depends how close you pay attention. I just went back down to 1ghz to see if I could squeeze out a bit more battery. I'm not doing physics on my phone or anything, so it's not generally noticeable.
Is there a way to save the stock kernel so I can revert if I don't like the imo kernel I try?
Can I use his lean kernel while stock rooted?
I'm hoping it helps with my keyboard lag.