Graphical slowdown with Torian capital ships

Running TotA with the 1.92 alpha.

For some reason, any time I have a Torian frigate or battleship on screen the framerate drops to about half.  When I shift the screen so it isn't visible, go to tactical zoom, or get an intelligence report on any ship that isn't a Torian frigate, the framerate goes back to normal.  The ships themselves don't look particularly wrong, they just slow the screen down a lot.
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