React 19 adds a ~300ms delay to page load with a fresh TanStack Router app.

[ryanstaniforth]

Which project does this relate to?

Router

Describe the bug

When using React 19 with a fresh install of TanStack Router, routes are not loaded until after a ~300ms delay. This is true even with defaultPendingMinMs: 0.

Initial report here: #1765 (comment)

Your Example Website or App

https://test-tsr.pages.dev

Steps to Reproduce the Bug or Issue

1. Create a fresh TanStack Router app with a couple of nested routes.
2. Vist nested URL in browser.

Expected behavior

No delay should be present.

Screenshots or Videos

No response

Platform

• OS: macOS
• Browser: Chrome
• Version: 1.114.29

Additional context

No response