It seems you aren't caching results. Cos I typed in Apple.com and received a too many checks error instead of just returning a cached result.

* A slight tweak to your site allow you to save cash and handle surge traffic with your current server.

1. Returning cached results for sites that's have been recently checked.

2. Collect email addresses and mail the result when it's ready.

That's all.

It's a much better experience than leaving the tab open, frantically refreshing the page to see if the queue is reducing.