Death, especially the way they are all handled, requires pain and suffering. An individual's death experience is not something you can replicate. Their pain, suffering, and death is just as traumatic to one as it is to the other.
Here's how you reduce the pain and suffering: Stop eating them.
Simple as that.
Just a review, from here:
Federal law in the United States requires that animals should be
stunned before they are slaughtered. The following types of stunning
are used: captive bolt stunning and electrical stunning. However, this
law is often broken at these slaughterhouses.
This indicates that the law is broken often, probably due to speed-slaughter ...