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I'm happy to report that this issue seems to be fixed (on my 5K iMac) with version 1.4.1 of Affinity Designer. Nothing else changed. best Thomas

Hi Matt, hi justwilliam, thank you for help. I tried your suggestions but the effect is still the same. Now i returned the iMac 5K, this one is too risky for me ;-) best, Thomas

Thanks, Paul. Already tried the Apple Diagnostic Tool and several Benchmarks and Programs to check, if there is a problem with the graphics card. There is none, the graphics are lightining fast every time. Tried Cinebench, Illustrator CC2015, Final Cut Pro X and others. May there is a optimisation issue with Affinity on these fast machines? Are there any other users out there with AMD m295X on Retina iMac seeing scrolling stuttering or is anything smooth? best Thomas

Hi, i have the problem, that scrolling in Affinity Designer 1.3.2 stutters (is not smooth) when the page is zoomed about 1000 % and higher. This can be a simple A4-Page with one grey Ellipse on it. When i zoom in more than 1000 % and scroll using the magic mouse it stutters. I'm using Yosemite 10.10.4 on an iMac i7 5K with AMD M295X (4 GByte) and 32 GByte RAM. Other software does work as expected and i have no reason to believe, there is something wrong with the hardware or system. I even tried reinstalling Yosemite with no success. Since scrolling and zooming in Affinity is so incredible smooth on every other Mac i tested, i'm not sure what is going on. Even tried on an iMac i5 5K, M290X (2 GByte) and was not able to reproduce the issue. Yes, this is a far less capable machine with the same Retina-Display… Is there something i can test? Any ideas? best Thomas