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That's the problem of your computer. Since the last update, I can play with about 300 units on my computer. I haven't created the game for extremly large battles with thousands of units. There are other things in the game like the destruction, dismemberment and player controls.

Btw you can't just change the engine if you want to. You would have to restart the development if you change the engine.

The problem its not with my pc. I have a really good computer. I don't know what's wrong. Thanks for responding to so many comments.