$ csi -s run.scm                                          !

first run
srfi-41: 7927
2.473s CPU time, 1.723s GC time (major), 2634198 mutations, 1063/18713 GCs (major/minor)

lazy-seq: 7927
0.017s CPU time, 0.01s GC time (major), 8936 mutations, 4/261 GCs (major/minor)

second run
srfi-41: 7927
0s CPU time, 2012 mutations, 0/17 GCs (major/minor)

lazy-seq: 7927
0s CPU time, 10 mutations, 0/2 GCs (major/minor)