One possibility is if your images are on a hard drive that goes to sleep and then takes a long time to power up when accessed. If that isn't it then you might try turning off GPU acceleration in your Lightroom preferences. How much free disk space do you have? How much RAM? What operating system?
Thanks for reply Jim,
I turned off GPU acceleration as first thing, I have 170GB free disk space and 16GB RAM and Windows 10 but I think you may be right - my catalog and photos are on encrypted Truecrypt drive. It may explain why this may be slow, but it won't explain what it does during startup. It is not sleep/powerup because I used this disk before turned on LR. Do you have any tips what to check? The only idea I have is to create new catalog, but I would like to understand the problem.
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You could try creating a new catalog. But I question whether you would see much difference. One thing you could try would be to COPY your catalog file to your SSD drive and double click on it in its new location to see if that helps your performance. The catalog can be on any drive connected to your computer. And accessing the catalog from a different drive isn't going to cause any problems.