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Dear Sir:



Unfortunately, unable to reproduce, with lot of D750 (and other cameras too) files memory footprint is within expected bounds (1100-1500Mb, may be slightly larger with 50-100Mpix files).



What to try:

 1) Upgrade to latest release candidate: https://www.fastrawviewer.com/blog/FastRawViewer-1-4-4-release-candidate

Not much changed in respect of memory handling, but it is much easier for us to test current version.



  2) Try to switch video mode in Preferences - GPU Processing - Graphics Engine (try other variants, different from your current one).



If #2 will help, it will look like graphics resources (textures) leak and may be due to bugs in video driver. Meanwhile, what videocard/drivers do you use?