on non testdata/1.fs

name        old time/op    new time/op    delta
ZodbDump-4     313ms ± 1%      98ms ± 0%  -68.81%  (p=0.008 n=5+5)

name        old alloc/op   new alloc/op   delta
ZodbDump-4    75.0MB ± 0%     0.1MB ± 0%  -99.89%  (p=0.008 n=5+5)

name        old allocs/op  new allocs/op  delta
ZodbDump-4     2.16M ± 0%     0.00M ± 0%  -99.91%  (p=0.008 n=5+5)