I'll probably get a lot of flak for this, but I feel, at least for me, a laser is a distraction. You have to turn it on, acquire the dot, and your target. I feel like I'm spending too much time on the first two.
No flak, but this simply doesn't have to be, and simply shouldn't be, the case.
You MUST start by acquiring the target. How else would you know whether it's a threat?
That's paramount; locate and identify your target.
Now, maintaining hard visual focus on your target, you bring the gun up and into play. You should be able to turn on the laser during that move.....with ZERO loss of time. Even with a manual switch, much less an instinctive switch.
Third, the hands follow the eyes....when the gun approaches your vision....which is focused on the target....the dot should come into play very nearly, if not perfectly, centered on the threat....shoot. Don't study the dot....don't try to make it perfectly centered and perfectly motionless. If you START with you eyes boring into the center of the target, the dot will come there on its own. Heck, you'll find you can do it from the hip...with your weak hand... without even seeing the gun.
If you can focus on a light switch across the room...swiftly, smoothly, raise your hand and point your index finger at it. Only after your fingertip has stopped moving, shift your focus back and forth from the switch to the fingertip and see how they line up....you did pretty well, didn't you?
You can bring a laser into play and in perfect alignment with the target much faster and with less effort than you can iron sights.....if you WANT to.
And nobody has ever suggested you have to give up your iron sights to have a laser.