Multithrea​ding and RS232 data too slow processed

Question

Hello,
Hope someone could help with this issue.  I have simple application which process ASCII data coma separated from serial port at speed of 115.2kbps. There is 6 columns  of unsigned short data .  I set-up COM call back function to receive data and I created separate thread function to plot data  on a 6 graphs - PlotWaveform() used.  Plots roll-over from beginning every time it receives more then 3000 samples. There is couple of more command buttons to set-up serial port, save data to a file, and exit application.
What is problem?  Application runs as intended but more and more slow with each received data sample. It is visible how graph plotting slows down. Apart from this,  all command buttons do not respond on cliks. (I need to click few minutes on them to get attention.)
Thanks
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Answer 1

Thanks Roberto,
a) I continiously receive RS232 data from external device without request. I install  COM callback func.
InstallComCallback (comport, eventMask, notifyCount,eventChar, ComCallback, NULL);  where is:
static int eventChar =13;   
static int notifyCount =115;
Call back functions where I process data and store them into 6 arrays of 3000 elements:
void CVICALLBACK ComCallback(int portNo, int eventMask,void *datax);
b)  I assume ComCallback is called every notifyCount samples.
c)  Second thread what I installed plots only 6 received data arrays in the ComCallback(). 
static int CVICALLBACK PlotingThreadFunc (void *functionData)
  while(1)
                  if(plotFLAG == TRUE)
                                    plotFLAG = FALSE;
                                    //Plot Array1
                                    PlotWaveform (panelHandle, PANEL_GRAPH, CapMeasureArrayData1,
                                                  ​                                          u16_DataIndexC, VAL_UNSIGNED_SHORT_INTEGER, 1.0, 0.0,
                                                  ​                                          0.0, 1.0, VAL_FAT_LINE, VAL_EMPTY_SQUARE, VAL_SOLID, 1,
                                                  ​                                          VAL_RED);
                                         to ..........
                                    //Plot Array6
                                    PlotWaveform (panelHandle, PANEL_GRAPH_CAP6,
                                                  ​                                          CapMeasureArrayData6, u16_DataIndexT,
                                                  ​                                          VAL_UNSIGNED_SHORT_INTEGER, 1.0, 0.0, 0.0, 1.0,
                                                  ​                                          VAL_FAT_LINE, VAL_EMPTY_SQUARE, VAL_SOLID, 1,
                                                  ​                                          VAL_RED);
 return 0;
The plotFLAG is set in the ComCallback() when data is received.
d)  I plot as above, whoole data arrays when data is received.
e)  “Plots Roll-Over”  I meant: Plots are window into data steram and when it is plotted max. number of elements (3000) then arrays are erased and start new data plot from beginning.