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Very large .uexp file

Hi!

I recently noticed that one of my maps generates an extremely large .uexp file, almost 500MB. Compared to the other maps it’s more than 10 times larger.

It contains few actors. A pretty large landscape, but other maps has bigger landscapes.

https://answers.unrealengine.com/storage/temp/232255-uexp.jpg

I also noticed that the landscape actor for this specific level has a MUCH larger instanced section count. It seems that if I create a large single landscape, that is one instance. Then if I use the add tool it keeps adding instances for each click For this level I pretty much added all those quads as I as going, resulting in thousands of instances. Could that be generating this humongous .uexp file?