Gwenview memory usage

Wheezy amd 64, TDE 3.5.13.2. I use Gwenview to view .tiff files, these are Architectural D drawings scanned to .tiff. They range in size: 350K>1.1M. The feature I kike about Gwenview as a viewer is I can view a directory full of tiff files and browse thru them using the toolbar. The downside, it seems, is that after viewing about 10 or so files all 8gb of memory is used, all other apps have been swapped out so checking mail or any other task is slow ..actually the workstation becomes to slow to be productive. Memory is not released between file views..is this normal? This is first app I have noticed using all memory so quickly..seems unusual. Thanks -- Peace, Greg