> - Are other profiles also so slow? For example the standard matrix?

No, they are fast. Standard matrix is applied using OpenCL:
[dev_pixelpipe] took 0.036 secs (0.028 CPU) processed `input color
profile' on GPU, blended on GPU [export]

> - Does it get better when you disable OpenCL? It wasn't used for the profile
> step, but sometimes copying buffers back and forth is the real bottleneck and
> it gets counted as module runtime.

With OpenCL disabled, the converted RawStudio profile is slow,
standard matrix is fast:
[dev_pixelpipe] took 9.218 secs (16.960 CPU) processed `input color
profile' on CPU with tiling, blended on CPU [export]
vs.
[dev_pixelpipe] took 9.218 secs (16.960 CPU) processed `input color
profile' on CPU with tiling, blended on CPU [export]

> - How much (free) memory does your computer have?

It's an old box with only 4 GB of RAM.
> free
             total       used       free     shared    buffers     cached
Mem:       4046984    3515600     531384      48304     237772    1266132
-/+ buffers/cache:    2011696    2035288
Swap:     67108860     898944   66209916

> top
KiB Mem:   4046984 total,  3814072 used,   232912 free,   413652 buffers
KiB Swap: 67108860 total,   898728 used, 66210132 free.  1265756 cached Mem

This is with darktable loaded but inactive in the background.

Thanks,
Kofa

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