Is there anyway to optimize fixedupdate or multiscene physics for an android build?

I have a game I am building for android. The apk file builds, but when I try to run the application it crashes after only being on for a couple seconds. I took a look at my unity profiler and I can tell a lot of this load is coming from my fixedupate function (see the large CPU spikes in image). Is there any general way to optimize fixed update or maybe slow down fixedupdate to be optimized for Android?

Thank you!