The big three domestic parcel carriers – UPS, FedEx and the U.S. Postal Service – continued to perform admirably in the midst of the torrent of peak holiday season packages, delivering ecommerce orders on time at a rate of 97% or higher, according to data from Shipmatrix.

The figures also indicate that ongoing investments in technology, facilities and labor are paying off at the most critical period of the year, when Shipmatrix estimates 2.5 billion packages will…