UnityEditor.Scripting.ScriptCompilation.EditorCompilation.CheckCyclicAssemblyReferences() takes a very long time when there are many assemblies and complex dependencies. It greatly reduces the iteration time. In our project, modifying a simple .cs file would spend >2 minutes in the "pre-compile" stage of refreshing the scripts.

In addition, it sounds like this step should only happen on .asmdef changes, not on .cs changes.