[android-developers] Why a single String.format reduce the FPS from 35 to 25 ?

Hi,  String.format("%.3f, %.3f, %.3f", float_1, float_2, float_3); // FPS 25  // FPS 35 StringBuffer buff = new StringBuffer(); buff.append((int)(float_1*1000)); buff.append(',');
buff.append((int)(float_2*1000)); buff.append(',');
buff.append((int)(float_3*1000)); buff.append(',');
 Device is HTC Hero.

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