uffering BIO, like a BIO pair, data must be written into or retrieved out of the BIO before being able to continue.</p>

<p>Many systems implement Nagle&#39;s algorithm by default which means that it will buffer outgoing TCP data if a TCP packet has already been sent for which no corresponding ACK has been received yet from the peer. This can have performance impacts after a successful TLSv1.3 handshake or a successful TLSv1.2 (or below) resumption handshake, because the last peer to communicate in the hand