Reasoning of nf_conntrack_checksum=0

What is the reasoning of changing default nf_conntrack_checksum=1 to 0? After searching Internets I've found only information about very old bug in processing small (<64) packets which is long fixed (3.*). Is there any other reason?

It's for avoiding some csum_partial() calls which can be a bottleneck for network performance.

Do you have any link to read more about it? I want to understand how critical this problem is.