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Hi, during the last days I created about 50 HDR/dng files (Canon 5D3, 3 images merged) using the new LR CC HDR Merge function. Now, after the merge, when I edit the dng file (22 MPixel, 85 MB) LR slows down extremely. The main performance issue is not changing the sliders but waiting until the image is rerendered! After a development change it takes often 10-20 (!) seconds until the image is rendered. In library module, mostly I have to wait 20 to 40 seconds until a preview is rendered. Often I wait forever and the preview is NOT rendered. Then I have to restart LR and then again have to wait 20-40 seconds until the image is rendered. During rendering about 50% of a i7-3770 CPU (i.e. 2 cores are fully loaded!) are used. Sometimes the CPU load goes up to 100% (i.e. 4 cores are used!) during rendering the image. Below is an example of the load while rendering a preview for more than 2 minutes. The worst case is using the compare mode in library module. When comparing 2 HDR/dng files, I have to wait sometime 60+ seconds until both previews are rendered. This is an unacceptable waste of my working time! I would like to edit images and I do NOT like to wait 20 to 40 seconds VERY OFTEN until the image is rendered and until I can continue to edit the image. Please investigate this strange behaviour! Manfred BTW: I use a NEC 30 inch display with 2560x1600px. Performance issues are independant if I enable/disable GPU support.