Ticks is a simple client-side mod that renders the skybox moving at the frame rate instead of game tick rate.
Not recommended for use with shaders!
Ticks works automatically and creates config/ticks.json with the default transition duration. Edit transitionTimeMillis there while the game is closed.
If you've found a bug or a version incompatibility, or if you have a suggestion, please post it here. Here is a simple guide on how to do that.
