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I recently got Canon 90D, which produces CR3 files. I've had Affinity Photo for over a year now, but never worked on any raw files. So when I began working on CR3 files I was surprised how slow performance was. When I mean slow, I mean I wouldn't be able to see changes I make for 30-60 seconds. Sometimes longer. Everything takes extremely long. Not only the raw editor is slow, but after I develop the image regular activities in Photo are extremely slow. Sometimes trying to sharpen images I wonder if I made changes or not. Everything is sluggish and slow. So I finally got fed up with it and got a sample DNG file online, about 40 MB. From the moment I opened it everything was fast and changes almost instant. Nothing was as slow as what I've been experiencing with CR3 files. Even after developing image, all Photo activities are fast. I used Adobe's DNG converter app and converted my CR3 files to DNG. And what do you know, everything works fast. Much faster than CR3 files, 20x faster. Here's what I got: - Photo 1.9.2.1035 - Windows 10 x64 - Intel core i7-8665U CPU @ 190 GHz, 2112 Mhz, 4 cores, 8 logical processors - 48 GB ram - Intel UHD Graphics 620 - Nvidia Quadro P520 I've tried using both built-in Intel GPU and Nvidia GPU as renderers, no change in performance. Both had slow performance editing CR3. I'm including CR3 file and a converted DNG file for comparison. Would appreciate some feedback. For now, I'll probably start converting CR3s to DNGs. IMG_0871.CR3 IMG_0871.dng