Pre JIT issue

Hello,

I found some performance drops when a method is called first time, i think it is related to JIT runtime compiling.
I've tried some trick to precompile my method on startup like here: http://answers.unity3d.com/questions/757357/how-to-compile-function-to-prevent-jit-spikes.html
but the lag is still there.
Is it know issue and the only way to prevent JIT spikes is to call that method earlier?

Thx for you help.