GPRS Data Transfer Slow

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Python

TCP/IP

Hi,
I am trying to make a connection between GT863-PY and TCP-IP server running on a pc. When i first made it, i sent a short sentence of 35 characters to the server and almost every 1 or 2 seconds the data was successfully sent to the server. After, i tried to send a long sentence of 140 characters at the same period but it took a time between 20-30 seconds. Why did the time spent for the data to be sent to the server change so much although the size of the sentence did not change so much?
The GPRS configuration is below;
AT+CGDCONT=1,"IP","internet","0.0.0.0"
AT+CGQMIN=1,0,0,0,0,0
AT+CGQREQ=1,0,0,3,0,0
AT#SGACT=1,1
AT#SCFG=1,1,300,90,600,50
AT#SD=1,0,PORT,SERVERIP
Can you help me?