viewtofile command is slow

Anybody experiences this problem? This command is used in the code of Generate Experiment Report. I found each picture will take about 7 to 8 seconds to be saved into a file. This makes Generate Experiment Report extremely slow as typically a bunch of pictures will be saved.

The command can be tested in a Script window simply by doing:
viewtofile(sv(), "c:/test.bmp")

If there is a workaround to this command, I would like to know.

Thanks very much!