Hey Everyone - After reading this thread, I noticed the solution is not here. I found it already on another thread and it works like A MIRACLE. Hope this is helpful. And thanks to its author. "do not forget that osx is based on unix. what helped me is changing of 'bird' process priority ('bird' process is responsible for icloud replication). Double click on ☁️ iCloud icon in finder to see progress. Go to Terminal ps aux | grep bird You will see your bird process id, in my case it is 815. serg 815 98.8 0.8 4542828 137776 ?? U Thu09PM 2047:53.94 /System/Library/PrivateFrameworks/CloudDocsDaemon.framework/Versions/A/Support/bird Check current priority of bird process ps -fl -C 815 (Replace 815 on your bird process id from step 3). If you never changed it before, it will be 0 (under NI column, but formatting of output is not nice). Change priority (negative numbers are high priority, based on research -20 is the highest, but do not put it, I suggest to put -10) to do it. sudo renice -n -10 -p 815 (again replace 815 on your bird process id from step 3). It will ask for password if you are not root currently in terminal. If it worked, you should see progress in the iCloud progress dialog you opened on step 1. I cannot guarantee it will work always, as iCloud is blackbox. Unfortunately i.e. mac has a unix core, but all above it is blackbox proprietary software"