Chrome feels slow when dozens of tabs compete for memory. The fix most people reach for is tab discarding: the tab stays in your tab strip, but Chrome unloads the page from RAM until you click it again.
How discarding works
Both Chrome's built-in Memory Saver and tab-freezing extensions use the same underlying browser mechanism. A discarded tab keeps its title and icon, uses almost no memory, and reloads when you return to it.
That means the real difference isn't how they free memory. It's how much control you get.
Chrome Memory Saver
You'll find it at Settings → Performance → Memory Saver. It decides on its own when to sleep tabs, and you can exclude specific sites.
Strengths: zero setup, built in. Limits: you can't set the exact timer, and it works for casual use rather than heavy tab workflows.
A freezing extension
An extension adds controls Chrome doesn't expose. In KeepIt you can:
- Choose the timer: freeze tabs after 15, 30 or 60 minutes of inactivity.
- Freeze on demand with one click for the current window.
- Rely on built-in protections: the active tab, pinned tabs, tabs playing audio, tabs still loading, and tabs on work domains like Google Docs, Gmail, GitHub and Figma are skipped.
The trade-off nobody mentions
Discarding a tab throws away its in-page state. An unsent email draft or a half-filled form can be lost. That's true for Chrome's Memory Saver, too. Good tools warn you and protect risky tabs by default, and KeepIt shows a warning before you enable auto-freeze.
A safe setup
- Pin the tabs you never want touched.
- Start with a 60-minute timer. Shorten it only if you don't notice reloads.
- Keep your important sessions saved, so freezing never becomes a data-loss risk.
- Check Chrome's Task Manager (Shift+Esc) before and after to see the difference yourself.
So which one?
Use Memory Saver if you want zero setup and keep a modest number of tabs. Add a freezing extension if you run long research sessions, want a predictable timer, or want freezing tied to the same tool that saves your sessions.