Yes disabling replays will do a bit but wont fix an issue that would be caused by the mod itself.
If you're really committed to diagnosing why it's lagging take FPS logs of both vanilla and your mod as baseline comparisons.
Then make a copy of your mod and start reverting changes half at a time. i.e. delete half of the things in the 'instances' folder for your copied mod, then see if there's lag. If it doesn't lag then the issue would be in the deleted half, if it does lag then delete half again. Repeat this process until you've narrowed it down.
This method is known as half splitting. It's useful but only if there's a singular cause. It also wont work if the cause is from two instances in conjunction i.e. a unit with an ability. For your purposes the causes would most likely be within the abilities, sbps, ebps, or any of the ai folders so I'd start by deleting those first.
You'll want to take extra care to not overwrite your mod with the copy. Ultimately it'd take several hours to diagnose but perhaps you'll get lucky.
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