What version of Tailwind CSS are you using?

v4.1.x

What build tool (or framework if it abstracts the build tool) are you using?

Vite 6.2.4

What version of Node.js are you using?

v22.14.0

What browser are you using?

Chrome,

What operating system are you using?

Windows

Reproduction URL

https://github.com/zyycn/tailwindcss-v4.1.x-speed

Describe your issue

Tailwindcss v4.1.x ，hot update in 4.0.x is between 100ms-200ms，but in 4.1.x is 2.3s-3s !