gistfile1.m

    const NSUInteger testCount = 1000000;
    {
        CFAbsoluteTime t = CFAbsoluteTimeGetCurrent();
        GLKMatrixStackRef stack = GLKMatrixStackCreate(NULL);
        GLKMatrixStackLoadMatrix4(stack, GLKMatrix4Identity);
        for (NSUInteger i = 0; i < testCount; i++) {
            GLKMatrixStackPush(stack);
            GLKMatrixStackMultiplyMatrix4(stack, GLKMatrix4Identity);
            GLKMatrixStackPop(stack);
        }
        NSLog(@"time GLKit: %f", CFAbsoluteTimeGetCurrent() - t);
    }
    
    {
        kmMat4 identity;
        kmMat4Identity(&identity);
        
        CFAbsoluteTime t = CFAbsoluteTimeGetCurrent();
        kmGLLoadIdentity();
        for (NSUInteger i = 0; i < testCount; i++) {
            kmGLPushMatrix();
            kmGLMultMatrix(&identity);
            kmGLPopMatrix();
        }
        NSLog(@"time kazmath: %f", CFAbsoluteTimeGetCurrent() - t);
    }