Adding Effects freezes the program?

[them38977460]

Sometimes if I try to add multiple effects to several clips too quickly, the effect will hang and the entire program will freeze. It still appears to be responding, but the only way to get it working is by ending it in the task manager. It's not common, but I'm not gonna let it happen again. Do you know about this? What do I do?

[Ann Bens]

Post computer specs.

Elements build,

Media used (not just mp4 but also codec or source).