I noticed the same/similar symptoms a couple patrols ago, actually. 512x would be somewhat choppy, and 1024x was ridiculous. I actually got stuck in 1024 for a good bit because it would not even register keystrokes to lower the time compression-- it took a ship sighting to finally get me out of it.
First, I kinda doubt the problem is a memory leak. If it were a memory leak then saving, shutting down SH3, and reloading should fix the problem. Also, a memory leak would likely cause worse performance over time whereas, at least in my case, performance seemed pretty consistenly bad until I got back to port.
I suspect there is some sort of condition that gets applied occured which somehow necessitates excess calculations. I never visited any ports on the patrol where this occured to me, so we don't have anything in common there.
At the time, the only mod I had installed was the d3d9.dll to allow me to run at 1280x1024. I had assumed this was related to the dll, but if you weren't using it, maybe I'd change my mind....
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