Slow start time on WP8: CreateMonoScriptCache

We're experiencing slow start times on a moderately-sized WP8 project. According to the VS profiler, 42% of the start time is taken up by CreateMonoScriptCache, which I'm assuming (looking at the rest of the call stack) is finding all of the MonoBehaviour methods (Update, Start, Awake, etc.). Is this correct? Is there any way to speed this up or to have more control over when and how the script cache is built?