I was stunned at how long (a full minute?) the old copy of Open Office took to load, even though I remember running it on the same machine! (With my i7 laptop with SSD and 8 GB of RAM, OpenOffice loads in about 2 seconds)
Open Office has a pre-load option for quick launch. (At the expense of machine startup time.) You may have unwittingly selected that option on the newer machine when you installed it. 60 sec. versus 2 sec. doesn't sound right.