Recently for me, when opening razor, it is hanging for an amount of time while it tries to check for updates.. Usually takes like 30 seconds to get to the splash screen. Anyway the solution is this: open the command prompt, type in "regedit" and the registry editor will open. Should be multiple directories to choose from, click on "HKEY_CURRENT_USER" and look for and click on "software" followed by looking for "razor" and clicking on that. There should be a few files to choose from on the right of the directories. Look for "UpdateCheck" which for me was at the bottom of the list, right click and choose modify. Change the value of UpdateCheck from whatever it currently is to "020391E8A569A689" without the quotation marks.
