q-tree performance issue

[kaslav]

What happened?

Expanding or ticking q-tree component's parent node with 5939 children freezes UI and takes considerable time to expand or tick all children nodes. Using q-tree component increases memory by ~400mb.

What did you expect to happen?

Ticking or expanding tree's parent node should be fast.

Reproduction URL

https://stackblitz.com/edit/quasarframework-stackblitz-templates-ebcl3htf?file=src%2Fcomponents%2FSlow-Tree.vue

How to reproduce?

1. Go to provided reproduction URL
2. Click 'Select all' checkbox

Flavour

Quasar CLI with Vite (@quasar/cli | @quasar/app-vite)

Areas

Components (quasar)

Platforms/Browsers

No response

Quasar info output

Operating System - Windows_NT(10.0.26100) - win32/x64
NodeJs - 22.14.0

Global packages
  NPM - 9.7.2
  yarn - Not installed
  pnpm - Not installed
  bun - Not installed
  @quasar/cli - 2.5.0
  @quasar/icongenie - Not installed
  cordova - Not installed

Important local packages
  quasar - 2.18.1 -- Build high-performance VueJS user interfaces (SPA, PWA, SSR, Mobile and Desktop) in record time
  @quasar/app-vite - 2.2.0 -- Quasar Framework App CLI with Vite
  @quasar/extras - 1.16.17 -- Quasar Framework fonts, icons and animations
  eslint-plugin-quasar - Not installed
  vue - 3.5.13 -- The progressive JavaScript framework for building modern web UI.
  vue-router - 4.5.0
  pinia - Not installed
  vite - 6.2.3 -- Native-ESM powered web dev build tool
  vite-plugin-checker - Not installed
  eslint - 9.23.0 -- An AST-based pattern checker for JavaScript.
  esbuild - 0.25.1 -- An extremely fast JavaScript and CSS bundler and minifier.
  typescript - Not installed
  workbox-build - Not installed
  register-service-worker - Not installed
  electron - Not installed
  @electron/packager - Not installed
  electron-builder - Not installed
  @capacitor/core - Not installed
  @capacitor/cli - Not installed
  @capacitor/android - Not installed
  @capacitor/ios - Not installed

Quasar App Extensions
  *None installed*

Relevant log output

Additional context

No response