convertTo performance in Android native code

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I working on developing app for android os. I write the code in c++ and use jni.

I have to convert mat from Mat3f to Mat3b in the native c++ code.

I use convertTo :

floatImg.convertTo(ucharImg, CV_8UC3);

ucharImg type is cv::Mat3b, floatImg type is cv::Mat3f.

the issue is the performance of this code in android:

on android this convertTo code takes ~2300 milliseconds! (on window all my function takes ~150 milliseconds)

Is there is a solution to this performance issue?