over 5 years ago - Sofeltis - Direct link
Hello, sorry to hear that.
That's how steam is doing update. It updates only difference in files. Instead of downloading complete 21 GB, you are downloading only few MB and that's requires some time to merge into the big one. We will reduce this time in the future for sure. If you have SSD it's pretty fast, but on HDD it requires 10 - 20 minutes.