new_u: 8 wallclock secs (n=508)
old_u: 7 wallclock secs (n=217)
new_u: 5 wallclock secs (n=508)
old_u: 4 wallclock secs (n=227)
new_u: 5 wallclock secs (n=528)
old_u: 3 wallclock secs (n=227)