When you upgrade to Windows 10 and have lot of data on OneDrive, first thing you will notice is OneDrive trying to sync all data from OneDrive Online to your Windows 10 PC. The download should go smooth when you have limited amount of data, but incase of large data, you will see Windows 10 getting slower and network speed is almost nil for internet browsing needs.
On Windows 8.1, OneDrive can be easily paused from taskbar icon by right-click context menu on OneDrive icon, but on Windows 10 you will no longer see Pause. Apparently, I think this is a miss from Microsoft when they developed the app for Windows 10. Unfortunately there is no way to actually pause the sync action for now!
So all we can do is simply right-click on the OneDrive icon on taskbar and click Exit. This should stop your network hog issue and you should be able to browse internet. You can anytime launch OneDrive by typing OneDrive from taskbar search box and Sync process will resume.
Stay tuned with us for more updates. We will update this post as soon as Microsoft figures out this problem and includes Pause in upcoming OneDrive updates.