Users with machines with 2 or less receive a warning message in the logs that the number of threads is raised to 3. This message comes by default because lettuce uses the number of processors to configure the number of threads per thread pool. The user needs to take action to get rid of the warning.
Ideally, lettuce uses the preconfigured minimum of 3 so the default falls not below 3 threads even if the machine has less processors.
Use at least 3 Threads when configuring default thread count #309