Why is the Neural Network training slow when I don't use the Matlab Toolbox?

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I am trying to optimize neural weights using the standalone Levenberg-Marquard algorithm, but the ANN training is much slower than when using the same algorithm in the Toolbox (trainlm). What causes this?
Standalone Levenberg-Marquard = 30 minutes
trainlm = 5 seconds
Same final accuracy...

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