I don't see improved speed at rendering previews to be one of the things changed in Lightroom 6.3/Lightroom CC 2015.3.
What is the size in megapixels (or pixels height and width) of your original images?
They are Fuji RAF RAW images each 32.2MB. 4896x3264px
I was not expecting improved speed from the latest update. I was expecting the slow preview building problem to have been fixed.
This is a very old CPU, and while I don't have any direct experience with this exact CPU, my gut feel is that you need a faster CPU.
Yes it is old (note that it is a Core2 Duo processor not a slower dual-core processor. My processor uses a socket 775 so I cannot upgrade the processor. I agree that a modern system would be better but it means a completely new computer.
However my system meets the Adobe system spec of :
- Intel® or AMD processor with 64-bit support*
- Windows 7 with Service Pack 1, Windows 8, Windows 8.1, or Windows 10
- 2 GB of RAM (8 GB recommended)
- 1024 x 768 display
- 1 GB of Video RAM (VRAM). 2 GB of dedicated VRAM is suggested for large, high-resolution monitors, such as 4K- and 5K-resolution monitors.
- 2 GB of available hard-disk space
- DVD-ROM drive required if purchasing Adobe® Photoshop® Lightroom® retail boxed version.
- OpenGL 3.3 and DirectX 10-capable video adapter for GPU-related functionality
- Internet connection and registration are necessary for required software activation, validation of subscriptions, and access to online services.†
Strange that the making of previews has suddenly become dramatically slower since I changed from LR 5.2 to cc. Nothing has changed with my hardware. 17 seconds per image seems excessive.
Specs don't seem relevant to me. It is undeniable that a faster CPU will cause the tasks performed by your computer to happen faster.
Slow preview building with Fuji cameras has been discussed here before.
I find it's slower with my Fuji cameras. It seem that Lightroom has to do more number crunching with Fuji X-Tran files to create previews.
What are your settings for preview size and quality?
Set to Auto 1920 and high. I'll change the quality to medium and see what happens,
I changed to medium quality but still with Auto 1920. The Standard preview of a new set of 28 images reduced the build from 8 minutes to 4 minutes 20 seconds.
Glad you've seen an improvement. dj_paige is right to suggest you need a faster CPU to get any more improvement.
I'm using the Auto/Medium setting on my PC but with a 4K monitor and one of the first i7 CPUs, it's not what I would call fast when it comes to building previews, but as the rest of LR is OK, I'm happy to live with it for now.