I am experiencing load problems at my site. Can you guys make a mod that limits the amount of guests allowed to browse your site to a number, x? And if x gets exceeded, simply force registration.
It would only increase your load, since you'd have to check who was browsing the site at every pageload. Best bet is to tackle the problem server-side.
You'd have to look at the logs and identify the cause of the load problems. I'm assuming your server is managed so perhaps you should have a word with the guys in charge.