MEGA2560 SLOW SERIAL SPEED

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hello, i'm working on arduino mega2560 board , using 2 serial ports using 2 serial connection delaying response time of detecting change of data.
in project i'm using modbus ttl 1 serial port , other port used gsm modem.
if use 1 port in programming data response rate fast.
what problem same issue happened me earlier arduino uno in using 1 serial , other spi.
i've attached program also, please give advie or solution fix it.
thanks

it looks have 0.5 second delay every time write sms message.  do need those?

i going post code, comments, long. 


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