如何防止应用程序在长时间运行过程中冻结？

The app seems to freeze sometimes when we try to pass a lot of imported files at once, which is done a each call of the function below for each file so the proposed solution is to add a sleep, but I can't seem to find proper documentation or explaining on how to handle it, or if I can even pass it as a parameter in a function.The app seems to freeze sometimes when we try t