I:R - Massive pause every month when in giant war

[Ekyman]

Description of problem
Massive pause every month when in giant war

What platform are you playing on?
Steam

What game version are you running?
1.0.2

Please select any/all DLC you have enabled.

Do you have mods enabled? No

Please explain your issue is in as much detail as possible.
When in a giant war (Rome vs Phrygia) I get a huge pause (maybe 10 seconds or more) on one day roughly every month. The mouse cursor doesn't become the thinking icon, and it's much longer than the delays for a new ruler, declaring a war, or making peace.

The issue doesn't happen in peacetime or in smaller wars.

It happens regardless of whether battles are currently ongoing or not.

Steps to reproduce the issue.
Play for a month while in a giant war. It seems to happen on any speed.

The attached save is during the war and so should have the pause within a month.

I'm playing with ironman on; I don't know if that matters.

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[pevergreen]

Reproduced on 1.0.3. Savegame is from 2 August 676 and issue occurs on 4 August 676.

Game "hangs" every 29 days in the attached save, for roughly 30 seconds on my setup. Interface is still interactable, but actions (disband mercs, change army pathing) are not updated until the hang is over.
I could not tie the hang to any action (siege rolls, combats etc) and it seems to be exactly every 29 days. 4 August, 2 September, 1 October, 30 October all hung for me.

No spike noticed in CPU usage or RAM increase. Game is not autosaving at the time - next ironman auto save occured after roughly 3 of the hanging events.