4.x: low performance on resource constraint environment

[dkropachev]

A customer claims to have performance issue with the driver on kubernetes on pods with vCPU: 4. They explain that looking at the pods they observed that java is mostly locked on CompletableFuture.getUninterruptibly Also they have claimed that advanced.connection.pool.local.size helped to overcome this issue.

We need to investigate where this constraint coming from.