my code:

time ./latestentries.pl
entry: 15970  gr5  2014-09-29
entry: 79485  gr8  2014-09-29
entry: 135788  gr7  2014-09-29
entry: 221  gr2  2014-09-29
entry: 18669  gr9  2014-09-29
entry: 46760  gr1  2014-09-29
entry: 4960  gr3  2014-09-29
entry: 9486  gr0  2014-09-29
entry: 19710  gr4  2014-09-29
entry: 56757  gr6  2014-09-29

real    0m8.689s
user    0m8.617s
sys     0m0.060s

-------------------
anno's code:

micha@laptop ~/prog/perl/test $ time perl test-anno.pl
962757, gr0, 2014-09-29
964472, gr1, 2014-09-29
984704, gr2, 2014-09-29
980128, gr3, 2014-09-29
985851, gr4, 2014-09-29
931318, gr5, 2014-09-29
976880, gr6, 2014-09-29
988367, gr7, 2014-09-29
992654, gr8, 2014-09-29
962175, gr9, 2014-09-29

real    0m4.556s
user    0m4.424s
sys     0m0.036s

-------------------
and duff's entry:

micha@laptop ~/prog/perl/test $ time perl test-duff.pl
100154  gr5  1990-00-10
5654  gr8  1990-00-10
2318  gr7  1990-00-10
9789  gr2  1990-00-10
19151  gr9  1990-00-10
91314  gr1  1990-00-10
124846  gr3  1990-00-10
14858  gr0  1990-00-10
175946  gr4  1990-00-10
95691  gr6  1990-00-10

real    0m3.497s
user    0m3.452s
sys     0m0.036s