MATLAB: How to slow down the plotting speed

graphMATLABplotpythonspeed

I would like to change the plotting speed of the following code.
I've tried to edit the TimeStamps part like these
  subplot(2,1,1)
  plot(t1/100,s1)
  ylim([-10.0 10.0]);
  title('s_1')
  
  subplot(2,1,2)
  plot(t1/100,s2)
  ylim([-10.0 10.0]);
  title('s_2')
  xlabel('Time (s)')
but the plotting speed was not changed.
Entire Code
tx = daq.createSession('ni');
s = daq.createSession('ni');
s.Rate = 400000;
ultraFreq = 40000;
numCycle =8
addAnalogOutputChannel(tx, 'Dev1', 'ao0', 'Voltage');
th=addlistener(tx, 'DataRequired', @queueMoreData);
addAnalogInputChannel(s,'Dev1', 'ai0', 'Voltage'); 
ch = addAnalogInputChannel(s, 'Dev1', 'ai1', 'Voltage'); 
h = addlistener(s, 'DataAvailable', @plotData); 
s.DurationInSeconds(1);
queueOutputData(tx, y');
startBackground(s);
tx.startForeground();
function plotData(src, event)
  t1 = event.TimeStamps(:,1);
  s1 = event.Data(:,1);
  s2 = event.Data(:,2);
  subplot(2,1,1)
  plot(t1,s1)
  ylim([-10.0 10.0]);
  title('s_1')
  
  subplot(2,1,2)
  plot(t1,s2)
  ylim([-10.0 10.0]);
  title('s_2')
  xlabel('Time (s)')
end
function queueMoreData(src, event)
  queueOutputData(tx, y');
end

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