Chrome and Edge can accept a disk-cache size flag; Firefox has advanced disk-cache preferences. A bigger cache is not a guaranteed speed boost, and these values are not a hard limit on every type of browser storage. Keep the original settings so you can undo a test.
What are you trying to increase?
| Storage | What it holds | Is a disk-cache flag the answer? |
|---|---|---|
| HTTP disk cache | Reusable page resources such as images and scripts. | It can influence this cache. |
| Memory cache | Resources kept in RAM. | It is a separate setting or browser decision. |
| Website app storage | Data an app keeps through storage systems such as IndexedDB. | No; website storage quotas are a different issue. |
| Saved passwords, bookmarks and downloads | Your saved information and files. | No; increasing cache is not a backup method. |
Cache helps only when a resource can be reused. It cannot repair a slow internet line, an overloaded server or a page that keeps requesting new data. Clearing it can fix stale resources, but the next load may download them again.
Chrome and Edge on Windows: use the correct flag
The Chromium policy definition and Edge policy guide describe --disk-cache-size. A managed policy can override the flag. Edge recommends automatic cache management for normal use.
- Copy a working desktop shortcut so you keep the normal one.
- Close the browser fully, including any background instance, before testing the changed shortcut.
- Open the copy’s Properties → Shortcut and keep its existing executable path.
- Add a space after the closing quote, then add the flag below.
- Apply the change and start the browser from that specific shortcut.
--disk-cache-size=268435456This example requests 256 MiB in bytes; it is an example, not an ideal size for every PC. Use two ordinary hyphens and an equals sign. The old Edge form -disk-cache-size-... was incorrect.
The value is a hint to the caching system, so total cache storage can be larger. On a managed PC, check chrome://policy or edge://policy and ask IT rather than changing registry policies yourself. These Windows shortcut steps do not apply to Edge on a Mac; its policy guide lists platform-specific controls.
Firefox: disable smart sizing before setting capacity
Firefox’s current preference definitions say disk capacity is used when smart sizing is false. This corrects the earlier article’s instruction to turn smart sizing on.
- Record the original values, then open
about:config. - Find
browser.cache.disk.smart_size.enabledand set it tofalsefor a manual-capacity test. - Find
browser.cache.disk.capacityand set the desired value in kilobytes, not the Chrome flag’s byte value. - Restart Firefox and test the same task.
Do not create missing preferences or copy a huge number without checking the installed version. Mozilla’s Configuration Editor guide explains how to reset changed preferences. Use Reset to return to defaults if the test does not help.
What about Opera?
Do not copy the earlier article’s typographic dash or malformed shortcut path. Check the current Opera version’s supported controls before applying a Chromium example; sharing a browser engine is not a promise that every startup option behaves identically.
Test whether the change helps
Compare the same pages with the same connection, and watch disk space as well as load times. Keep automatic management if you cannot show a useful improvement. For inspecting what a page actually loads, see page source and developer tools.
Information checked October 13, 2026, using the guides linked above.