I wonder why the behaviour of Matlab(using an Activex) change if I compile the Mfile to get a stand-alone application?

Hi, I wonder why, when using an activex in MFILE to make preview of a camera, everything goes at the right speed. But when I compile this Mfile, I'm just able to get a frame every four seconds?

piece of code used:

    actx = actxcontrol('ActiveUSB.ActiveUSB.1', [5 5 200 200], gcf);
    actx.set('Display',true)
    actx.set('Acquire',true)

the Activex is from ActiveUsb (to use usb3 vision compliant cameras) and I use Windows 7 Sp1 32 bits et matlab R2013b.