Introducing Pigment CSS: the next generation of CSS-in-JS - MUI
Briefly

Trouble is, the 'traditional' CSS-in-JS solutions we rely on aren't able to come along with us because the React context API only works on the client. Pigment CSS is MUI's new zero-runtime CSS-in-JS solution, providing RSC compatibility and performance benefits compared to Emotion in v5.
Material UI acknowledges the need to update without causing major disruptions for users, leading to the development of Pigment CSS, focusing on smooth migration for existing users and compatibility with other component libraries.
Read at Mui
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