ANN ARBOR Mich. —Domino’s Pizza says overhauling the foundation of its proprietary Pulse restaurant technology yielded a system that is more secure, reduces downtime in failures and costs less to own.

What good can we say about the first quarter? Industry same-store sales, up 1.9%, were better than the fourth quarter by 0.5%. That’s about it. Traffic remains an irritating industry issue, falling ...