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Improving its efficiency would mean re-writing it entirely, since it's an SPA app with 4 MB of JavaScript.

It could, but it doesn't. As many have remarked already, it appears there is a bug that's causing the site to reload Google's recaptcha multiple times.

This is a big low hanging fruit fix, another is simply minifying the Forum's JS, there is also bound to be a lot that can be done on the Nim side to reduce the code size generated.

As far as I can see you already have a minification task [1] in your nimble file. May I ask you why you are not using it to save bandwidth both for your sever and your visitors?

[1] https://github.com/nim-lang/nimforum/blob/master/nimforum.ni...

> it appears there is a bug that's causing the site to reload Google's recaptcha multiple times

I forgot to mention that it is not a bug. See https://github.com/google/recaptcha/issues/335 for example (I believe there are others issues like this in the repo)

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