You seem to have confusion between TLS handshakes and RSA operations.
In OpenSSL (which is used by many servers including node.js, nginx), RSA operation is always synchronous. Therefore, using Neverbleed does not impose new limits regarding concurrency.
You seem to have confusion between TLS handshakes and RSA operations.
In OpenSSL (which is used by many servers including node.js, nginx), RSA operation is always synchronous. Therefore, using Neverbleed does not impose new limits regarding concurrency.