SSH client creates 5 threads while connecting to host.

Is there a way to configure NIO threads when we connect to a host? I have a use case where I need to connect to 64 hosts from a single client. However, this process takes an excessive amount of CPU time.
sshd-SshClient[2200ad1]-timer-thread-1
sshd-SshClient[2200ad1]-nio2-resume-thread-1
sshd-SshClient[2200ad1]-nio2-thread-1
sshd-SshClient[2200ad1]-nio2-thread-2
sshd-SshClient[2200ad1]-nio2-thread-3

Start by tracing SSH client connection setup and where the listed timer, resume, and NIO threads are created. Determine how thread counts could be configured for connections to multiple hosts, then verify that the resulting behavior reduces unnecessary CPU use without breaking client connections.

Written by the indexing model from the issue text.