The time given for the UltraSPARC bitslice client includes Rocke's optimized S-box circuits, which are not yet included in the other clients (roughly 5-15% speedup). It also includes some hand-tweaked assembly, which was necessary in order to run a 64-bit client under Solaris, since Solaris doesn't support 64-bit applications. See "The two-headed UltraSPARC client" for details.