You need to give more information. What do you mean by ~200 and ~30.
When you ping an IP address the response will be a round time trip figure in milliseconds (for the ping to go out and the echo or pong to come back). There is also TTL (time to live) figure which is essentially a counter in seconds that says when to discard the packet if it doesn't get through. Every device e.g. router that forwards the packet will deduct time from the TTL.
Are you pinging the desktop's IP from the laptop and vice versa?
In terms of COD4 performance, ping will not help you. Ping measures the network latency (the minimum time needed to send the smallest amount of data) it is affected by the receive & retransmit delay in the network card and router. It has nothing to do with bandwidth (max data that can be transmitted per second) or throughput (actual data transmitted per second).