Standard Previews are build on CPU/iGPU and not dedicated GPU (Notebook)

Question

Problem:

Standard Previews are build using the iGPU of the CPU and not the NVIDIA GPU. This is probably a lot slower! It really impossible loooong time for 1000 images. Like 15minutes or so...

Lightroom Classic version: 14.0.1 [ 202410161356-30922cfc ]
Operating system: Windows 11 - Business Edition

How to produce:

Import Images

Library - > Previews -> Build Standard Sizes Previews

Check Task Manager, dGPU is not used at all.

In case you are wondering: Yes all acceleration is active.

Edit: It seems its 100% CPU even and not any GPU.

The screenshot provided was also during video playback

Here is an updated screenhot while building when I paused video playback:

iGPU:

CPU:

Conrad_C · Accepted Answer

Yes, many of us have noticed that building a JPEG preview and building a JPEG export copy are, in theory, the same kind of thing. But in practice, the fact remains that today, for whatever reason, Lightroom Classic supports GPU acceleration for export but not for preview generation. That is just how it is right now.

Conrad_C · Answer

I think what you are seeing is simply the known fact that all non-Develop previews are built with the CPU. When Lightroom Classic builds previews, no GPU will help…not integrated, not discrete. Any integrated GPU activity you see is probably due to something other than preview generation.

I haven’t seen any documentation that says the GPU is used for generating previews. The Lightroom Classic performance settings shown do not mention previews at all. They mention (interactive) display (such as zooming), image processing, and export…not preview rendering.

GPU use outside of the Develop module is very limited at this time.

Using the GPU to accelerate preview generation is something people have asked Adobe to do, but I don’t think it has been implemented. Until they do that, the ways to improve preview generation speed are mostly about the CPU:

Use a CPU with higher single-core performance.
Use a CPU with more cores, and to take advantage of those CPU cores, make sure Generate Previews in Parallel is enabled in Lightroom Classic Preferences / Performance.
Lower the Standard Preview Size pixel dimensions and/or preview quality settings in Lightroom Classic Catalog Settings.

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