no-expensive-positioning-patterns

Warn when position: fixed or position: sticky appears in the same rule as expensive paint effects.

What this catches

• fixed overlays with backdrop-filter
• sticky headers with large box-shadow
• fixed elements with filter or clip-path

Rule options

Option	Default	Why
ignoreProperties	[]	Allows deliberate fixed or sticky paint effects after review.
positions	["fixed", "sticky"]	Fixed and sticky layers are more likely to repaint during scroll.

{
 "css-performance-budget/no-expensive-positioning-patterns": [
  true,
  {
   "positions": ["fixed", "sticky"],
   "ignoreProperties": ["box-shadow"]
  }
 ]
}