Catchup over P2P stops intermittently

[onetechnical]

Subject of the issue

If a node is configured as pure P2P (e.g. "EnableP2P": true and "EnableDHTProviders": true) then normal catchup will advance a several hundred rounds, then pause for a few seconds. Fast catchup works as expected. However, once fast catchup completes, the same behavior is observed for regular catchup until caught up.

Your environment

• Software version: 3.26.0.stable [rel/stable] (commit #0d10b244)
• Operating System details: Mac OS X 15.0.1 (Sequoia) Apple M1 Pro

Steps to reproduce

1. Use above config settings to set up a P2P node
2. Start a regular catchup

Expected behaviour

Normal speed catchup, without pauses

Actual behaviour

As above - proceed several hundred rounds, then pause for a few seconds, over and over.

[urtho]

IMHO this might be the same as #6054

[onetechnical]

IMHO this might be the same as #6054

This might be - I'll have to experiment with it.

Incidentally, I don't see the same issue with TestNet.