How can I convert CGI input to UTF-8 without Perl's Encode module?

Don't use escape() to create your posted data. This isn't compatible with URL-encoding, it's a mutant JavaScript oddity which should normally never be used. One of the defects is that it will encode non-ASCII characters to non-standard %uNNNN sequences based on UTF-16 code units, instead of standard URL-encoded UTF-8.

Your current code won't be able to handle that.

Don't pre-optimize. Do it the conventional way first then profile and benchmark later to see where you need to optimize. People usually waste all their time somewhere else, so starting off blindfolded and hadcuffed doesn't give you any benefit.

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