Slow and hangs

I started Making movies on my iPad and mac. In the beginning it was great. However when you start making a longer movie it was SLOW and hung many times when changing or adding things. Had to restart twice and lost all changes the second time and had to start over! Not cool when I had spent so much time on it. I ended up finishing the movie but was unable to make some changes because it kept hanging and I couldnt risk another crash.
Way way too many bugs. Not like the old Apple apps. Acting more like a typical PC with major app problems.

Cccoast about iMovie, v2.2.3