Game works great in editor, but lags in packaged and launched versions

Development Platform & Builds
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1

Hello, everybody.
Our game works perfectly smooth and fine in the editor, but after packaging, it lags so much that physics break down in the best case, and the game is unplayable in the worst case. We tried looking at answers to other similar problems, but nothing seems to fix it.
Any ideas?
Thanks

2

It seems to run much smoother if I package it as 32-bit(I use a 64-bit system), yet it is not perfect and there is still an object that goes through walls.
Here is the bp:

139441-error.png
139441-error.png990×394 56.5 KB

139442-error2.png
139442-error2.png1021×337 109 KB

Thanks

3

Turning on the CCD option in that object’s collision seems to stop this bp from going through walls. Yet the lag has not completely disappeared, so we still need help in that. Thanks

4

Turning on the CCD option in that object’s collision seems to stop this bp from going through walls. Yet the lag has not completely disappeared, so we still need help in that. Thanks