No. The long time is largely dependant on the size of the project and the disk setup.
Do you mean:
1. The delay is unrelated to the scanning of clips
2. It's not possible to stop the scanning?
The project file is only 40MB. I've had 100MB or even larger project file before and never see such long delay. Could you please give me some pointer on how to reduce this delay (right now about 30 seconds)?
It's not possible to stop the scanning? No.
If you have not seen this long delay before, what changed?
My old project used to have a few hundreds clips. The editing is a bit complex with a lot of effect.
This project has 2000+ clips but there is not much effect.
Effects do not have a major impact, the number of clips have.