Recaptcha server resource usage

thecreator_

Hello everyone,
How much resources does Recaptcha use on the server? Does it use serious resources? (Assume there are hundreds of sites on the server)

Recaptcha is a good solution for spam blocking, but I'd love to know if there's an alternative method.

CyberneticTitan

Barely any. The basic flow is:

1. You embed Recaptcha on your website
2. Google issues the user a challenge
3. If user completes captcha successfully Google generates a token, and gives the user this
4. The user sends this token with the form data to your backend
5. You check the token with Google via simple HTTP request
6. If successful you process the form data and continue, otherwise issue a rejection

So the load on your server is the additional check with Google.