If you have a decent computer this shouldn't lag. Anyway for a knockback system 50+ units seems a bit excessive. I have tested this with a fair few units, probably 30-40, and it was fine.
However, when near trees with like 30+ units it may get a bit laggy, due to how the trees are filtered, especially if you are using the extended function for 30+ units. On the other hand though, you can use the extended version and get rid of any special effects by doing "nothing.mdx" or something, and also put a 0.00 for the Area value (for trees) and there will be much less lag.
And there should not be any crashing or errors created by this system.
However, when near trees with like 30+ units it may get a bit laggy, due to how the trees are filtered, especially if you are using the extended function for 30+ units. On the other hand though, you can use the extended version and get rid of any special effects by doing "nothing.mdx" or something, and also put a 0.00 for the Area value (for trees) and there will be much less lag.
And there should not be any crashing or errors created by this system.