Comparison of runtime of different FS versions before and after refactoring.

Version 0.2.2j was published by Benjamin Eltzner [22], version 0.2.3 is the first version after start of refactoring process. Version Alpha3.0 is an unpublished developer version with refactoring process completed. Version Alpha6.0 is using OpenJDK15.Benjamin Eltzner于[22]发布了0.2.2j版本；0.2.3版本为重构流程启动后的首个版本。Alpha3.0属于未对外发布的开发者版本，此时重构流程已全部完成。Alpha6.0版本采用了开放Java开发工具包15（OpenJDK15）。