FEATURE: IBD incredibly slow with proxy enabled

IBD is incredibly slow even if `go private` is disabled. We need to comment out `proxy` in the bitcoin.conf when `go private` is disabled or at least add a `fast sync` feature.

The issue mentions bitcoin.conf, proxy handling, and the go private setting; start by locating where those settings are assembled and reproduce IBD with proxy enabled. Done means the chosen behavior is implemented and IBD is no longer reported as incredibly slow when go private is disabled, with the existing configuration behavior verified.

Written by the indexing model from the issue text.