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I have now managed to resolve this (all lag has vanished) by restarting my Mac - seemingly all the issues have gone away now. Thanks @NathanC and @MikeTO for the help with debugging, sorry for not trying the obvious solution earlier (although I have no idea why a restart would have this effect on Affinity)!

Hi @NathanC - have checked and the app is running natively. Have sent you a screen capture video privately to show you what's going on, along with the activity monitor trace. As I had mentioned earlier, the lag happens every time with certain files and is severe enough in certain cases to make Affinity basically unusable. Thanks again for your help!

Hi @NathanC, thanks for your reply! I have done some further investigation: - I have tried switching the display renderer to Metal as you have suggested but I haven't seen any changes in performance. - If anything, the issue appears to surface when affinity is taking less CPU/GPU rather than more. When the system is running smoothly, the CPU utilization jumps to 80%+ and the GPU to 30/40%+. When everything starts lagging badly (this includes almost everything: panning, zooming, moving objects, resizing objects, etc.), the CPU utilization is low (10-20%), as is the GPU utilization (<20%). - Sometimes, the issue rectifies itself for a long time period. However, I can routinely get it to resurface simply by restarting affinity, after which the default state is to immediately start being laggy after opening a document. Could this be an issue where not enough resources are being allocated to affinity (although this is unexpected, since I have a high-spec machine)? Thanks again!

I have 36GB RAM available. Have just turned off the metal setting but have seen no improvement. Problem still happens when unplugged unfortunately. All I need to do is resize an image or object a few times and it immediately starts to stutter.

Hi Mike - the issues are happening both with the Mac's trackpad and with a standard mouse. Issues also present both on my 4K 60Hz monitor and the mac's internal screen. I'm finding it really difficult to pinpoint what causes the issues due to it being intermittent. Screenshot of my performance settings attached here.

Version: 2.3.1 OS: Mac OS Sonoma 14.3.1 Hardware: M3 Max 2023 Macbook Pro 16" Issue: I am a long time user of Affinity Designer. I normally use a 16" 2019 Intel Macbook Pro and have had no issues on both Affinity Designer 1 & 2. I have now recently switched to an M3 Max Macbook, which is significantly faster than my older Intel machine. However, Affinity Designer 2 on the new machine is very frequently laggy (zooming in/out and panning very choppy, obvious lag when clicking between objects) even with very small documents containing a small number of items. Other times it goes back to normal with 0 lag. I am not running any other high-demand applications while using Affinity Designer. I have checked my performance settings but everything is set very high, including the use of OpenGL. Is this behavious normal? Is there something I am missing? Has anyone else encountered this issue? Would appreciate all insight, thanks!