Workstation topics · Computer basics
Why a computer slows down
🏠The everyday picture
A cook has a small worktop next to a big store room. With three dishes on the go, everything is within reach. With fifteen, the worktop overflows, and the cook keeps walking to the store room to swap things in and out. Every dish gets slower, even though the cook is just as skilled. A computer with too much open does the same.
📘What it really is
- Memory (RAM) is the worktop: fast, but limited. Every open app and browser tab takes some.
- Storage (SSD or hard disk) is the store room: big, but slower to reach.
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When RAM is full, the operating system moves things it isn't using right now out to storage and back again (this is called paging or swap). Storage is much slower than RAM, so everything feels slow.
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A nearly full storage slows things too: the OS needs free space for updates, temporary files and swap.
An SSD (solid-state drive) has no moving parts and is much faster than an older hard disk (HDD), which has a spinning disk inside. Changing an old laptop's hard disk for an SSD is often the biggest speed-up it can get.
📝A worked example
Meera's laptop has 4 GB of RAM. She has Chrome open with 25 tabs, a video call, and Excel. The laptop crawls.
| What she tries | Does it help? | Why |
|---|---|---|
| Closes 20 tabs she isn't using | Yes, a lot | Frees RAM, so less is swapped out to storage |
| Restarts the laptop | Yes | Clears RAM and stops programs that were stuck |
| Deletes a few photos | Not much, unless storage is nearly full | RAM was the problem, not storage space |
| Buys a "speed booster" app from an advert | No, and it may be harmful | Most such apps add more to run, and some are scams |
🖱️Try it
Open the tool that shows what's using your computer:
- Windows: press Ctrl+Shift+Esc to open Task Manager, then look at the Memory column.
- Mac: open Activity Monitor (search for it with Cmd+Space), then the Memory tab.
- Android: Settings, then Storage (Samsung: Settings, then Device care, then Storage; older Samsung phones say Battery and device care). Android shows storage use here; memory per app is harder to find, so on a phone check storage instead.
Which app is using the most memory? Close something you don't need and watch the number fall. Check how full your storage is too: if it's more than about nine-tenths full, it's time to clear some space.
✅Quick check
Will deleting photos fix a laptop that's slow because 30 tabs are open?
Show the answer
Not much. The tabs fill RAM (the worktop). Deleting photos frees storage (the store room), which helps only if storage is nearly full.
Why does restarting often help?
Show the answer
It empties RAM and stops any program that got stuck or kept grabbing more memory, so you start with a clear worktop.
🧩Check yourself
Tap an answer to see why every option is right or wrong. There's no score and nothing is saved, so try as often as you like.