[op]

More on this:

The website received about 3500 visitors during 12 hours after I posted this review request here on HN. Thank you guys! Thanks HN! It has been way more than I expected!

There's a bottleneck somewhere in the algorithm that creates wordoids. That's why wordoid.com is irresponsive sometimes. The webserver and the database seem to run smoothly.

[gills]

Do you mean that when I click "go", the wordoid-generating algorithm is kicked off during the request cycle? Have you considered generating the wordoids asynchronously (offline) and keeping an index of them and their metadata?