However if you're running a server you should stay on the previous Java release until your pack is known to work on the new version.
When enabled, the mod will count how long each mod takes to load.
Once you reach the main menu, the file will be found in "/.minecraft/surge/loadtimes/".
Here are but a few examples of why you might need or want to manage your version number.
If you want to preserve an older world you created without risking that world experiencing corruption or update problems when you move to a newer version of Minecraft, you’ll need to lock the profile to the older version.
Allows the animation of Block and Item textures to be disabled using the "/surge animation" command.
Running the command again will enable texture animations again.
This profile is named after your Minecraft username and it automatically updates to the most current version of Minecraft without any intervention your behalf.
For other players, however, managing your version number (and creating separate profiles for different purposes) is an important component of the Minecraft experience.
Major Java updates include changes that can (and often will) break old code, which means that Minecraft, Forge and the mods may need to be updated to work properly.