Frame relay:Long ping delay

Hi,

I have setup 2 routers connected to a frame relay switch.When i ping
locally,it give me a long delay and remotely,the delay is half of the
local router.What can cause this ???
Remote PING

Router#ping 172.21.3.2

Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 172.21.3.2, timeout is 2 seconds:
!!!!!
Success rate is 100 percent (5/5), round-trip min/avg/max = 32/32/32 ms


Loc ..
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