(1) Explain your problem, don't simply post "This isn't working". What were you doing when you faced the problem? What have you tried to resolve - did you look for a solution using "Search" ? Has it happened just once or several times?
(2) It's also good to get feedback when a solution is found, return to the original post to explain how it was resolved so that more people can also use the results.
John, if you're working on your own standalone P6 database - try creating a new database and use that. If the speed improves in the new database, then the issue lays with the original DB you were using, possibly its size, or perhaps some corruption. If the speed in the new database is equally bad, then yes, it may mean issues with your PC.