CPU usage skyrockets to 100% when trying to select high tolerance using flood tool on complex layers.

[saraartist]

Maybe this is normal but it was worth dropping a thread so it is known. My normal CPU usage while running affinity photo v2 and streaming video and also having task manager open is only ever 8-12%. When I tried turning tolerance up to 90-99% on the flood selection tool and then select on a complex layer or all layers, the whole program froze for a moment but did not crash and my CPU usage shot up to 100%.

• What is your operating system and version: Windows 11, freshly updated
•    What happened for you (and what you expected to happen): expected all pixels to be selected, which is eventually what happened, but my CPU usage skyrocketed and the program froze for 30seconds.
•    Provide a recipe for creating the problem (step-by-step what you did): Have any document with many colors, choose flood select tool, turn source to all layers and tolerance to 95% and drag your mouse across the image
•    Any unusual hardware (like tablets or external monitors or drives that may affect things) or relevant other applications like font managers or display managers: I have one external monitor on my laptop but it never usually effects anything. I have 16gb of ram and a good graphics card. Computer is less than 1 year old

[David Stegmann]

I run an iMac 2015 with 16GB Ram. I have freezes in Photo when changing the brush size (and other). When I change the brush size in Photoshop, the CPU is at 50%... it goes over 100% when changing the brush size in Affinity !! I can't use Affinity due to these high CPU loads and freezes and would love tolerant what causes such an issue compared to large package like Adobe which run flawlessly. 

[Chris B]

Heya,

Our app will use whatever resources are available. Maxing out the CPU to 100% is what we want to do. Unless it's causing an issue, you do not need to worry. The Flood Select Tool does indeed demand quite a bit from the CPU. Couple that with the fact the workspace is refreshing at 60fps and it's no surprise this maxes the CPU.

There were talks of slowing down the refresh rate of the marching ants which is what I think is causing the bulk of the CPU usage but I have nothing solid to report about that.

[debraspicher]

There's quite a few functions in AP that ramp up CPU to 100%, but I don't experience much lag on V2... so far...*pounds table*. My CPU cooler wooshing let's me know when CPU is pegged and I'm constantly running sensors on another screen so I hear all, see all...