Here are some results from a 2.6GHz Pentium 4 using 46 files (more or less) representative of my cd collection:
1.0.2 Beta 1 size (bytes) percent encoding speed decoding speed
-p0 1623010174 54,14 123,15 143,82
-p0e 1615739367 53,9 90,77 142,61
-p0m 1612224463 53,78 49,39 143,48
-p1 1606970522 53,6 105,84 128,02
-p1e 1604905867 53,54 84,38 126,64
-p1m 1601617850 53,43 43,95 128,65
-p2 1581734990 52,76 78,44 118,64
-p2e 1578204991 52,64 59,8 118,56
-p2m 1575307844 52,55 32,7 117,73
-p3 1571489425 52,42 46,6 110,66
-p3e 1569148414 52,34 35,55 111,28
-p3m 1567753199 52,3 23,72 110,63
-p4 1561633116 (!) 52,09 29,64 101,24
-p4e 1561633116 (!) 52,09 29,62 100,34
-p4m 1560386681 52,05 16,37 94,28
-p5 1558565633 (!) 51,99 21,82 93,94
-p5e 1558565633 (!) 51,99 21,85 94,16
-p5m 1557170401 51,94 10,43 95
as comparison: 1.0.1
-p0 1612577422 53,79 114,09 129,76
-p0e 1604816093 53,53 85,04 130,2
-p0m 1601334557 53,42 40,34 129,3
-p1 1582760941 52,8 82,75 122,65
-p1e 1578210266 52,65 59,44 121,17
-p1m 1575082039 52,54 30,13 121,68
-p2 1572754511 52,46 51,74 118,28
-p2e 1571904174 52,43 33,34 118,88
-p2m 1569993171 52,37 25,26 119,68
-p3 1562677922 52,13 31,69 98,83
-p3e 1561954330 52,1 19,04 97,81
-p3m 1560108995 52,04 15,44 98,73
-p4 1558386544 51,98 20,21 91,72
-p4e 1557468738 51,95 10,61 94,47
-p4m 1556940882 51,94 7,7 92,94
-p4e and -p5e produce identical files to -p4 and -p5, did you remove the extra evaluation level for those presets?