com.apple.quicklook.ThumbnailsAgent cpu usage

Hello,

I have the com.apple.quicklook.ThumbnailsAgent which is using a lot of my cpu everytime and I can't figure out what this is and what is it's purpose? Do any of you guys have this problem and do you know if there is a way to reduce this?

I'm running MacOS 10.13 beta 1 on a macbook pro 15 , 2,4 GHz, mid 2010 with 8 GB RAM and 500 GB SSD

Thanks !



EDIT : Problem solved I don't exactly know how : I just disconnected from iCloud and desactivated icloud Drive and reactivate it