Stream recorded images to hard drive using IMAQ write file 2

I made a Labview GUI to control the microscope and data acquisition and I am using the IMAQ write file function to write the data. The data is recording and allocating into the RAM, then all of the recorded images are saving into the hard drive. This saving process is running very fast, but the the data de-allocation from RAM is very slow. I am using IMAQ dispose to release the data from IMAQ create, but it does not work very well for IMAQ write file 2 and the the data is released from RAM very slow.