Version and "Not responding"

Part 1.  I have EmC version 7.1.306460.  When I go to Menu>Help and select Check for Update, nothing happens.  How do I update?

Part 2.  EmC is exceedingly slow.  I suspect, due to “not responding.”  Opening EmC from Taskbar takes 2 minutes (I have timed all listed events).  Opening an email takes 45 seconds.  Moving from Mail to Calendar can take 3 minutes.  In every case, the first click results in "not responding.’  How do I get rid of this lag?