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PCI-6251: speeding up analogue input and output

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Jack
Jack 2019-11-6
I want to use Matlab to try out a real time control idea. I've found an old National Instruments data acquisition card PCI-6251 which connects directly to the PCI bus (no USB latency) so I expected it to run quite fast.
However, running in a loop:
tic;
for i=1:1000
vIn=s.inputSingleScan;
vOut=2*vIn;
outputSingleScan(s,vOut);
end
toc
takes over 3 seconds to run, (i.e. 3ms per cycle). Any suggestions on how to make it run faster?
Alternatively, would it run quicker using digital I/O. I would not mind using external ADC/DAC to speed things up.

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