Back forward cache

Or bfcache

Back/forward cache (or bfcache) is a browser optimization that enables instant back and forward navigation. It significantly improves the browsing experience for users—especially those with slower networks or devices.

bfcache is automatic, but you can observe the page transition events with pageshow and pagehide.

To optimise your page for bfcache:

• never use the unload event
• avoid using beforeunload unless absolutely necessary
• avoid using window.opener without rel="noopener"
• close open connections before the user navigates away
• update stale or sensitive data after bfcache restore
• test to ensure your pages are cachable

https://web.dev/bfcache

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