There is no 'fix' for this since this is not mod related, it is graphics and processing power related. For instance, if you play Napoleon Empire Realism with increased unit sizes via the preferences script, you will experience the same choppiness.
This is game related.
You could setting the unit size to large for 300 men per unit and/or decreasing other graphics settings.
There is a 'fix,' I am currently uploading a vanilla fire version of the mod.




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