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EMEFS doesn’t wait to redirect upon submit, so the “slow” part is on the server 🙂
But: the next version will replace the submit-button by a spinner upon submit, so double submits are no longer possible. Another workaround is to use the EME captcha, because that’s only valid for 1 submit too, but if you don’t want to use that: check the dev-version. If ok, I’ll release later on.