Krita 5.3 on Windows 11.
Issue:
Some time ago I made a test with an old render image of mine (1200 x 900 16bit integer) for testing a non-destructive glow effect. I consider this a simple, non demanding task.
The setup uses blur filters.
Those blur filters are slowing down Krita heavily.
I am posting because I like to ask if I should post this as a bug, to let the devs know about the issue?
File to test
Example
Enabling the groups which contain the blur filter:
(right click → watch in new tab or window to see the gif better / bigger - ignore the bad image quality, I had to compress heavily to get below the 3 MB upload limit)

If I disable the blur, everything goes faster.
I crosschecked with other image editing software. In those, the blur is fast - no delay or waiting for image operation to complete.
Test setup: Krita 5.3 on a notebook (a decent machine) - Windows 11.
CPU: Intel Core i7 - 10750H (6 cores, 12 threads)
- Max Turbo Frequency: 5.00 GHz
- Processor Base Frequency: 2.60 GHz
Ram: 16 GB
Storage: NVMe SSD
GPU: Nvidia RTX 2070 MaxQ + Intel® UHD Graphics
As you can see, the CPU’s potential is not really used.

