Artemiy Ryabinkov <getlag(at)ya(dot)ru> writes:
> Does it make sense to make this parameter configurable?
Not without some proof that it makes a performance difference on
common setups (which you've not provided).
Even with some proof, I'm not sure I'd bother with exposing a
user-tunable knob, as opposed to just making the buffer bigger.
We have far too many GUCs already.
regards, tom lane