I've had some similar issues working with large images, here's some things I've found.  First of all, if your image is in 16-bit precision, your operations are going to be slow.  GEGL is apparently optimized for 8-bit int and 32-bit float, so paradoxically you'll actually get a much smoother experience if you change the image precision to 32 bit floating point.  Trying to,   That's gotten the new GIMP to be pretty usable for me.  It's still not as zippy as the 2.8 series was, but it's also crunching a lot more data over 8-bit images.

On 04/11/2018 04:45 PM, jkhan wrote:
Good evening from a new user of GIMP,

I am venturing into some basic photo editing and installed 2.10 after realizing
the stable release (2.8.22) didn't support 16 bit color TIF files without being
converted to 8 bit.

After installing the program, I noticed it's running pretty slowly. Most menus
in the color menu are loading slowly but the most noticeable thing I'm noticing
is that it's taking anywhere from 10-12 seconds to load any preview for any
color adjustment.

Now I'm definitely new so I don't know much about this, but is this normal for
2.10? I am editing TIF files around 155MB and am running v2.10 on my Lenovo
Y700. It's running Windows 10 with 16GB of RAM, Intel core i7 6700HQ @ 2.60GHZ
and a GTX 960M. The photos and GIMP are running off my SSD. What I'm noticing,
however, is that during the sluggish performance, my task manager is showing my
cpu usage never reaches 50% and my RAM usage stays around 50%.

I have tried various fixes on the internet including increasing tile cache size
from 7 to 14 GB and increasing the undo memory. I have tried disabling color
management. None of these have worked to reduce or remove the sluggishness.

The same files I'm trying to edit on v2.10 don't reproduce the same sluggishness
on the stable release 2.8.22. The preview consistently loads in 2 or 3 seconds.

To wrap up here, I'm just looking for some help on whether this is a real
problem or just a result of the various system and file factors I listed above.

Thanks in advance for any help!

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