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Hi Elena!
It can either be because you have other software running in the background or because of cache issues with the browser.
I suggest you reboot the computer, then close any open programs that you don't currently need.
Please see this link on how to clear your cache: http://www.refreshyourcache.com/
Also I suggest you play Candy Crush on King.com
I saw on another thread a step by step instruction on how to transfer your game progress to King.com:
1) Go to King.com and login then click on settings (cog wheel, top right corner of screen)
2) Choose Account
3) Enter your password
4) Click on Synchronizing/ Connect to Facebook
5) Click on the two arrows to initiate the sync
Once done your progress is synchronized and you should now be able to play and progress without any issues.
Cheers :-)