Take readings from Lakeshore 336 T controller through VISA TCPIP, but very slow

I connected a Lakeshore 336 Temperature controller to a PC ethernet card by using a normal RJ45 cable.
The VISA resource name is set as "tcpip::192.168.0.12::7777::socket". But the readings is very slow. It takes about 2 seconds for reading one sensor data. But the manual says "10 readings/second".
I tried both Lakeshore 336 Temperature controller and PC connected to a router, but the same slow speed.
How can I get reading as fast as GPIB interface using Ethernet port?
Thanks.
LV2013SP1@Win7Pro
WT

Attached are the snapshots of the front panel and block diagram (with 2 probes) of the VI reading LS336 sensor.
There are 2 probes inserted. One is right after VISA Write, which shows no error; the other one is right after VISA Read, which shows error. But strangely, the VI still acquires the sensor readings correctly even the error occurs.
Thanks in advance.
WT

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