If I have misunderstood this then my apologies.

The valkeycompat.NewAdapter sets maxp to the current no. of cores. This is then used to scale out commands.
Even if one is running on 1 or less cores most operations are IO bound so this limit is unnecessarily restrictive.

Secondly this kind of setting should be user-controlled and not something arbitrarily set internally.

A better interface would be to add an option that allows the user to set this themselves using the functional option pattern.