Very low performance

[thegrasshopper104]

The app used 1.5GB of memory and 90% of CPU for several minutes and nothing happened to the image (it's fairly large tough, 24MP 6000x4000). I tried to apply a gaussian blur.
specs.:
Operating System: KDE neon 5.27
KDE Plasma Version: 5.27.4
KDE Frameworks Version: 5.105.0
Qt Version: 5.15.9
Kernel Version: 5.19.0-41-generic (64-bit)
Graphics Platform: Wayland
Processors: 8 × Intel® Core™ i7-3770 CPU @ 3.40GHz
Memory: 31.3 GiB of RAM
Graphics Processor: NVIDIA GeForce RTX 3060/PCIe/SSE2

(conjure:2): Gdk-WARNING **: 20:49:45.996: Server is missing xdg_foreign support

(conjure:2): Gtk-WARNING **: 20:49:45.996: Failed to export handle, could not set transient for
2023-04-30 20:49:59.236 | DEBUG | conjure.magic:open:27 - original folder: /run/user/1000/doc/de80a14d
2023-04-30 20:49:59.237 | DEBUG | conjure.magic:open:31 - original filename DSC04922.JPG
2023-04-30 20:49:59.915 | DEBUG | conjure.views.command_panel:on_command_change:40 - on_command_change 0
2023-04-30 20:50:06.239 | DEBUG | conjure.views.command_panel:on_command_change:40 - on_command_change 4
2023-04-30 20:50:06.241 | DEBUG | conjure.views.commands.blur:on_command_change:25 - on_command_change
2023-04-30 20:50:06.243 | DEBUG | conjure.views.command_panel:start_job:177 - start_job
2023-04-30 20:50:06.243 | DEBUG | conjure.magic:blur:135 - blur 139625415951936
2023-04-30 20:50:06.494 | DEBUG | conjure.magic:blur:138 - 0.0 3.0
2023-04-30 20:50:06.496 | DEBUG | conjure.magic:blur:139 - /run/user/1000/doc/de80a14d/DSC04922.JPG
2023-04-30 20:50:09.720 | DEBUG | conjure.views.command_panel:job_done:209 - job_done
2023-04-30 20:50:10.159 | DEBUG | conjure.views.commands.radius_sigma:on_spin_change:37 - 0.1
2023-04-30 20:50:10.159 | DEBUG | conjure.views.command_panel:start_job:177 - start_job
2023-04-30 20:50:10.159 | DEBUG | conjure.views.command_panel:kill:251 - killing 139627031365440
2023-04-30 20:50:10.159 | DEBUG | conjure.magic:blur:135 - blur 139625407559232
2023-04-30 20:50:10.411 | DEBUG | conjure.magic:blur:138 - 0 3.0
2023-04-30 20:50:10.413 | DEBUG | conjure.magic:blur:139 - /run/user/1000/doc/de80a14d/DSC04922.JPG
...
2023-04-30 20:50:28.291 | DEBUG | conjure.views.commands.radius_sigma:on_spin_change:37 - 15.89999999999996
2023-04-30 20:50:28.291 | DEBUG | conjure.views.command_panel:start_job:177 - start_job
2023-04-30 20:50:28.291 | DEBUG | conjure.views.command_panel:kill:251 - killing 139627031365440
2023-04-30 20:50:28.295 | DEBUG | conjure.magic:blur_gaussian:173 - blur_gaussian 139625365595712
2023-04-30 20:50:28.341 | DEBUG | conjure.views.commands.radius_sigma:on_spin_change:37 - 15.99999999999996
2023-04-30 20:50:28.341 | DEBUG | conjure.views.command_panel:start_job:177 - start_job
2023-04-30 20:50:28.342 | DEBUG | conjure.views.command_panel:kill:251 - killing 139627031365440
2023-04-30 20:50:28.350 | DEBUG | conjure.magic:blur_gaussian:173 - blur_gaussian 139626484323904
2023-04-30 20:50:28.392 | DEBUG | conjure.views.commands.radius_sigma:on_spin_change:37 - 16.09999999999996
2023-04-30 20:50:28.392 | DEBUG | conjure.views.command_panel:start_job:177 - start_job
2023-04-30 20:50:28.392 | DEBUG | conjure.views.command_panel:kill:251 - killing 139627031365440
2023-04-30 20:50:28.401 | DEBUG | conjure.magic:blur_gaussian:173 - blur_gaussian 139624982750784
2023-04-30 20:50:28.442 | DEBUG | conjure.views.commands.radius_sigma:on_spin_change:37 - 16.19999999999996
2023-04-30 20:50:28.442 | DEBUG | conjure.views.command_panel:start_job:177 - start_job
2023-04-30 20:50:28.442 | DEBUG | conjure.views.command_panel:kill:251 - killing 139627031365440
2023-04-30 20:50:28.465 | DEBUG | conjure.magic:blur_gaussian:173 - blur_gaussian 139625373988416
2023-04-30 20:50:28.493 | DEBUG | conjure.views.commands.radius_sigma:on_spin_change:37 - 16.29999999999996
2023-04-30 20:50:28.494 | DEBUG | conjure.views.command_panel:start_job:177 - start_job
2023-04-30 20:50:28.494 | DEBUG | conjure.views.command_panel:kill:251 - killing 139627031365440
2023-04-30 20:50:28.514 | DEBUG | conjure.magic:blur_gaussian:173 - blur_gaussian 139624991143488
2023-04-30 20:50:28.545 | DEBUG | conjure.views.commands.radius_sigma:on_spin_change:37 - 16.399999999999963
2023-04-30 20:50:28.546 | DEBUG | conjure.views.command_panel:start_job:177 - start_job
2023-04-30 20:50:28.546 | DEBUG | conjure.views.command_panel:kill:251 - killing 139627031365440
2023-04-30 20:50:28.578 | DEBUG | conjure.magic:blur_gaussian:173 - blur_gaussian 139626712913472
2023-04-30 20:50:28.843 | DEBUG | conjure.magic:blur_gaussian:176 - 16 3.0
2023-04-30 20:50:28.845 | DEBUG | conjure.magic:blur_gaussian:177 - /run/user/1000/doc/de80a14d/DSC04922.JPG
2023-04-30 20:51:14.181 | DEBUG | conjure.views.command_panel:job_done:209 - job_done
2023-04-30 20:51:24.582 | DEBUG | conjure.views.commands.radius_sigma:on_spin_change:37 - 100.0
2023-04-30 20:51:24.583 | DEBUG | conjure.views.command_panel:start_job:177 - start_job
2023-04-30 20:51:24.583 | DEBUG | conjure.views.command_panel:kill:251 - killing 139627031365440
2023-04-30 20:51:24.583 | DEBUG | conjure.magic:blur_gaussian:173 - blur_gaussian 139626492716608
2023-04-30 20:51:24.835 | DEBUG | conjure.magic:blur_gaussian:176 - 100 3.0
2023-04-30 20:51:24.836 | DEBUG | conjure.magic:blur_gaussian:177 - /run/user/1000/doc/de80a14d/DSC04922.JPG