TimeMaster: One-Click Slow Motion is a Blender add-on from Lazy3D for controlling time in your projects. It lets you slow down or speed up animations, physics, and scenes through an interface built into the Blender UI.
In the Armatures and Actions tab, you can add actions from selected armatures or all at once, then adjust the playback speed for all selected actions. Control is keyframe-based and can be modified at any point — keyframe the speed to 0.2 at frame 100, for example, to set up a slow-motion moment. The developer advises using slow-motion only after your animation is ready.
The Physics section scans your scene and lists objects with supported simulations, controlled through a single Time Speed slider. Supported types include Soft Body, Cloth, Fluid, Particles, Dynamic Paint, and Rigid Body. Geometry Nodes, Procedural Generators, Simulation Nodes, Shader Nodegroups, and Hair are not supported. A Documentation tab covers usage information.