Really nice demos. On my K3, 50% of the CPU time is spent in the Kernel (according to unreliable "top"). Probably, the eink driver could be a bit more optimized...
Code:
[root@kindle us]# time ./cosmegg
real 3m 56.15s
user 2m 9.67s
sys 1m 46.24s
The Moiré effects in the Cosmegg demo are nice :-)