It's likely premature optimisation. You may have a problem with bots signing up but I suspect at this stage it is not as large a problem as recruiting users.
You might also want to think about relying a little less on javascript. Try turning it off in your browser and see what you get. For me it was completely unusable and rather ugly.
You might also want to think about relying a little less on javascript. Try turning it off in your browser and see what you get. For me it was completely unusable and rather ugly.