A EBS VCP spawned program has big performance gap between two 64-bit Linux servers

I'm testing an EBS VCP product which will launch a request to run a spawned program named MSNW64.

I tested it on two 64-bit Linux servers.

It runs about 30 minutes on Server 1 but runs more than 2 hours on Server 2.

I use top -c to monitor the running process on different servers. I attach parts of extraction of top outputs as following:

Server 1:

top - 18:40:54 up 211 days,  2:29,  8 users,  load average: 0.24, 0.11, 0.12

Tasks: 301 total,   2 running, 299 sleeping,   0 stopped,   0 zombie

Cpu(s): 24.8%us,  1.5%sy,  0.0%ni, 72.0%id,  0.9%wa,  0.1%hi,  0.7%si,  0.0%st

Mem:  41155392k total, 40898116k used,   257276k free,   174460k buffers

Swap: 20966116k total,   126988k used, 20839128k free, 27549792k cached