Cache common element computations on vNode

Author: WilcoFiersCreated Aug 25, 2026Updated Sep 16, 2026

Labelsperformance

There are a few node computations Axe-core does over and over again. Things like reading the accessible name, or the role. We should look at caching these on the virtual node to see if it helps with performance:

javascript

class AbstractVirtualNode {
  // Pseudo code
  get role                  => memoize(this, getRole(this))
  get roleType              => memoize(this, getRoleType(this))
  get implicitRole          => memoize(this, getImplicitRole(this))
  get explicitRole          => memoize(this, getExplicitRole(this))
  get accessibleText        => memoize(this, accessibleTextVirtual(this))
  vNode.aria                => memoize([this, arg[0]], getAriaValue(this, 'aria-' + arg[0]).value)
  vNode.ariaSource          => memoize([this, arg[0]], getAriaValue(this, 'aria-' + arg[0]).source)
  vNode.ref                 => memoize([this, arg[0]], getResolvedRef(this, arg[0]))
}

Source: dequelabs/axe-core

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