SSH via Juniper EX808 is slow

Hi all.

I have this case like that. From my Core-SW (EX8208), I have a lot of interfaces (including interface vlan and L3 interfaces). I have l3-interface vlan.13, and a server 172.18.13.41.

If I ssh from my Core-SW by using l3-interface vlan for source IP, it's normal. But if I use L3 gigabit interface for this purpose, it's very slow. About 20 seconds, it has login banner

root@DC-SW-CORE-01> ssh 172.18.13.41 source 172.18.12.1 # 172.18.12.1 is l3-interfacce vlan.
root@172.18.13.41's password: (very fast)

root@DC-SW-CORE-01> ssh 172.18.13.41 source 172.18.253.249 (gigabit ethernet)

...

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.Very slow.

I don't uderstand this error. There is no routing or any fireall here. So what problem?