warmup time is nearly 8 times slower in 2.0 compared to 1.7 ( for 10k and 100k items)

key and values are < 64 bytes each
test #1 :
1.7 : warmup for memcached with 10k items takes 0.3 seconds
2.0 : takes 2.7 seconds

test#2:
1.7 : warm up for memcached with 100k items takes 4 seconds
[2011-09-09 17:05:56,078] - [memcapable] [140735244237152] - INFO - 1 ep_warmup_time : 417255

2.0 : takes 26 seconds