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To increase acquistion rate when using imaq usb

hey,
Im using Imaq USB VI's for a logitech webcam, im only acquiring at about 3 or 4 frames a second, i need it to be over 5 frames a second. I have a image/video properties VI in the program, this allows me to put the rate up to 15 per second, however in reality the rate is no where near this.I've also noticed that when i change the rate in the page,press apply and close and then reopen the page the new rate value hasn't saved and its back to the original value.when i change the resolution on the page and apply it, the new values does save.
Any help would be appreciated.
cheers.
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