Image display is extremely slow

I installed RawTherapee 5.11.
After clicking on a RAW thumbnail
it takes about 2 minutes for the image to appear.
For jpg images, it appears in a few seconds.
Editing operations after display are not heavy.
This does not happen with Lightroom 6.
Do I need to change any settings?

Windows10 Home Edition(64bit)
RAM:16gb
CPU:Core i7 7700k
GPU:NVIDIA GeForce GTX 1050 Ti

Where do you click on a raw thumbnail? Inside RawTherapee?



It takes 2 to 3 minutes for pic1 to display pic2.

What does your CPU utilization look like?
How much free RAM do you have?
How much free disk space?
Any other programs showing similar reluctance?

CPU usage is up to 15%, 30-40% overall
RAM is up to 4GB, 70% overall
Disk usage is 0-1%

I heard that 5.11 is very heavy compared to 5.10,
so I installed 5.10 as well, but RAW is displayed in a few seconds, so there is no problem.
However, when I start 5.11 after using 5.10, it freezes when switching folders.
Deleting AppData will fix it.

From where? I don’t see any changes in 5.11 that indicate this.

What processing profile did you use in 5.10? Does 5.11 still load the image slowly after applying the Neutral profile?

Have you checked your computer’s performance settings? 40% of the CPU sounds low. I can load a 40MP image in 8 seconds using the default processing profile which includes capture sharpening and highlight reconstruction. The CPU utilization was maxed-out on my old laptop (i7-6500U).

When I unchecked “Use included profile”
in the image processing settings,
it started displaying in a few seconds even in 5.11.
However, the image displayed is truly “raw”…

In 5.10, it displays instantly even without unchecking the box,
so I think it’s a bug specific to 5.11.
I’ll stick with 5.10 until it’s resolved.

Have you reported the bug on Github?

Which checkbox is that? Is it this one?


If so, make sure your default processing profile for raw photos is identical between 5.10 and 5.11, otherwise you are comparing apples to oranges. If they are the same and the speed difference persists, one of the active tools is slow. Try to isolate the slowness to one tool. The slowest tools are usually Capture Sharpening and Highlight Reconstruction, so you can try those first.