Well, here it is straight from them.
Why is Scrabulous slow?
There are a large number of users playing on Scrabulous (thank you!). Our new servers are getting ready and we should be migrating to a much better environment very soon. Thank you for your patience and understanding!
Well, I've about given up on some of my games. I know. I don't pay to play. So why gripe? Because I'm a huge fan! Since I don't have a favorite sports team, I root for my favorite online tools and applications. (We all have our hobbies.)
Don't give up on Scrabulous; they'll be back to full steam shortly. Just remember that it's slow because it's a big hit. You and I created this problem. Ha.
Keep bringing the challenges and rematches.