What's the difference between cached files and RAM on Mac?

RAM is your Mac's working memory: the active space where open apps and processes run. Cached Files in RAM is a portion of that space macOS uses to hold recently-used files so they reopen faster. It's not the same as disk cache, which is files apps store on your hard drive. Both are called 'cache' but they're in different places and behave differently.

How do I clear my Mac's cache?

It depends which cache you mean. Cached Files in RAM clear themselves automatically when an app needs the space. For disk caches, the safest route is Apple menu, About This Mac, More Info, Storage Settings, then click Recommendations and use Reduce Clutter. For browser caches, use the browser's own clear-cache feature. For specific app caches, quit the app and delete its folder from ~/Library/Caches.

Should I clear cached files manually on Mac?

For Cached Files in RAM: no. macOS releases them automatically when an app needs the space. Clearing them manually gives you a satisfying number in Activity Monitor but provides no lasting benefit. For disk caches: only if a specific app is misbehaving, your disk is nearly full, or you're troubleshooting a browser issue. Blanket cache-clearing is rarely necessary.

Will clearing cache speed up my Mac?

Rarely, and often the opposite in the short term. Cached Files in RAM exist to make your Mac faster: clearing them means apps that relied on that cache have to reload from scratch. Clearing disk caches frees up space, which can help if your disk is almost full, but won't speed up an app on its own. If your Mac is slow, quitting unused apps and restarting are more effective first steps.

Does restarting my Mac clear all cache?

It clears most volatile caches. Cached Files in RAM are wiped on restart because RAM is cleared when the power goes off. Many temporary app caches reset too. Disk caches in ~/Library/Caches are not automatically cleared by a restart; those persist until the app removes them or you delete them manually.

Cached files vs RAM on Mac: what's the difference and how to clear them?

Two different things on your Mac get called "cache." One lives in RAM and macOS manages it automatically; you can ignore it. The other is files apps store on your hard drive to speed up future work; those can grow over time but rarely need manual attention. Here's the plain-English version of both.

If you've opened Activity Monitor to investigate a slow Mac, you've probably seen a row labelled "Cached Files" sitting right below your used memory. It looks alarming. And then separately, someone tells you to "clear your cache" to fix a browser problem, and you're not sure if that's the same thing or something else entirely.

It's something else entirely. Let's separate the two.

The two things called "cache" on Mac

Your Mac uses the word "cache" for two completely different concepts. Understanding which one is which saves a lot of confusion.

Cached Files in RAM. This is what Activity Monitor shows under the Memory tab. When you open a file or use an app, macOS keeps a copy of that data in RAM after you're done with it. The logic: you might want it again soon, and RAM is much faster than loading from disk. If another app needs that RAM, macOS releases the cached data instantly to make room. It's a clever system, and it's entirely automatic. The "Cached Files" number in Activity Monitor isn't memory that's stuck or wasted; it's memory that's on standby, ready to be freed the moment anything else needs it.

Disk caches. These are files apps create and store on your hard drive, not in RAM. Your browser saves copies of website images, scripts, and stylesheets so the next visit loads faster. Apps save things like thumbnails, search indexes, and preferences in a folder called ~/Library/Caches. These files live on your drive and persist after a restart. They can grow over months and years of use, and on a nearly full disk, they're worth knowing about.

So: one is in memory and invisible to you (Cached Files in RAM), the other is on your drive and deleteable (disk caches). The word "cache" covers both.

Why you usually don't need to clear cached files in RAM

The number in Activity Monitor is not a problem to fix. It's macOS doing its job.

Think of it like this: if your Mac has 16 GB of RAM and only half is being used by open apps, it would be wasteful to leave the other half sitting completely empty. Instead, macOS fills that spare space with data it predicts you might need. The moment you open a demanding app, that standby memory is reclaimed in milliseconds.

This is why launching the same app twice in a row feels instant. The second time, macOS already has most of the app's data loaded and ready. Without this system, every launch would feel like the first.

Some third-party "cleaner" apps clear Cached Files to show you a dramatic before-and-after in their RAM usage meter. The number genuinely drops. But within a few minutes of normal use, macOS refills that space again. Nothing lasting was accomplished. See our longer post on how to actually free up RAM on Mac for what does make a lasting difference.

"Cached Files in RAM aren't stuck memory. They're memory on standby, ready to be freed the instant anything else needs the space."

The one metric worth watching in Activity Monitor is the Memory Pressure graph at the bottom of the Memory tab. Green means macOS has plenty of headroom. Yellow means it's working harder than usual. Red means it genuinely can't keep up and your Mac will feel slow. See our guide to what memory pressure means on Mac for more detail on reading that graph.

When clearing disk cache actually helps

Most of the time, you don't need to touch disk caches either. macOS automatically trims them when your disk gets tight, and apps generally manage their own caches responsibly.

There are a few specific situations where clearing disk caches genuinely helps:

A specific app is misbehaving. If Safari is showing stale content, or an app is crashing on launch, clearing that app's cache is a legitimate first troubleshooting step. You're forcing it to start fresh.
Your disk is almost full. When you're down to less than 10 percent free space, macOS performance suffers. Disk caches in ~/Library/Caches can sometimes account for several gigabytes, and clearing them buys you room. (Also see our guide to purgeable space on Mac, which is related.)
Browser-specific problems. A page that won't load properly, an outdated login state, or video that won't play sometimes comes down to a stale browser cache. Clearing the browser cache directly is the targeted fix.

Outside those scenarios, routine cache-clearing is mostly a placebo. Your Mac will rebuild the caches anyway, and in the meantime you've made things a little slower.

How to clear caches safely

If you do have a reason to clear caches, here are the right tools for each type.

Step 1. Check Activity Monitor, then leave Cached Files alone

Press Command-Space, type "Activity Monitor", press Return. Click the Memory tab. The Cached Files figure is there for information only; no action required.

Step 2. Check your disk space first

Before clearing anything on disk, find out if you actually have a space problem. Open Apple menu › About This Mac › More Info, then scroll to Storage Settings. macOS shows you what's using your drive in plain categories: apps, documents, system data, and so on. If you have plenty of free space, you probably don't need to clear any caches at all.

Step 3. Use Reduce Clutter for disk space

In Storage Settings, click Recommendations. macOS offers a "Reduce Clutter" option that surfaces large files, old downloads, and things it's safe to remove. This is the right tool for most people; it's built by Apple, it's conservative, and it tells you what it's removing before it removes anything.

Step 4. Clear browser cache through the browser itself

For Safari: go to Safari › Settings › Advanced, tick "Show features for web developers", then use Develop › Empty Caches.

For Chrome: three-dot menu at the top right, Settings › Privacy and security › Clear browsing data. Tick "Cached images and files", leave the time range as "All time" if you're troubleshooting, and click Clear data.

Browser caches are large and grow quickly. This is one of the more effective things to clear when you're genuinely short on disk space.

Step 5. Clear a specific app's cache from Library/Caches (for advanced users)

This is the manual approach and the one most likely to cause problems if done carelessly. Only do this if a specific app is misbehaving and you want to force it to start fresh.

Fully quit the app first (right-click its Dock icon, choose Quit).
Open Finder.
Hold the Option key and click the Go menu at the top of the screen.
Choose Library (it only appears when you hold Option).
Open the Caches folder.
Find the folder that matches the app (usually named something like com.apple.Safari or com.spotify.client) and move it to the Bin.

Do not delete the entire Caches folder. Only target the folder for the specific app causing trouble. Apple's own support guide on freeing up storage space on Mac is worth reading before you go digging in Library.

Step 6. Restart your Mac

A restart is the easiest cache-clearing action available, and the one most people skip because it feels too simple. It wipes Cached Files in RAM entirely (RAM is cleared when the power goes off). It resets most temporary app caches. If a piece of software is behaving oddly and you can't pinpoint why, restart first and see if the problem resolves before doing anything else.

Aim for at least one restart per week as a general habit. It keeps things tidy without any manual intervention.