Windows Search indexing constantly scans your files in the background so that searches return results instantly. On a modern SSD this is barely noticeable. On an older mechanical hard drive, however, that same background scanning competes for the disk's limited speed, and is a common cause of a PC that randomly freezes or feels sluggish for no obvious reason.
Key takeaway: Turning off or limiting Windows Search indexing reduces background disk activity on older hard drives, at the cost of slightly slower file searches.
Before you start: If your PC has an SSD, indexing is rarely a problem and disabling it brings little benefit – this guide is aimed specifically at PCs still using a traditional spinning hard drive.
Checking what's causing disk activity
- Open Task Manager (Ctrl+Shift+Esc) and click the Disk column header on the Processes tab to sort by disk usage.
- If Windows Search (Indexer) or "SearchIndexer.exe" appears near the top regularly, indexing is likely contributing to your slowdowns.
Limiting what gets indexed (recommended first step)
- Type Indexing Options into the Start menu search box and open it – this is a Control Panel tool that's still the right place for this setting.
- Click Modify to see which locations are currently indexed.
- Untick locations you rarely search, such as large media folders, and keep only your main Documents, Desktop and Email locations ticked.
- Click OK to apply and let the index rebuild for the smaller set of folders.
Turning off indexing completely
- Press Windows key + R, type services.msc, and press Enter.
- Scroll down to find Windows Search in the list.
- Right-click it and choose Properties.
- Set Startup type to Disabled, then click Stop to halt it immediately, and click OK.
Tip: After disabling indexing entirely, the Start menu search and File Explorer search will still work, but each search will scan files directly rather than using a pre-built index, so results may take a little longer to appear.
Weighing up the trade-off
Indexing exists purely to make searches faster, so disabling it is a straightforward trade: slightly slower searches in exchange for noticeably less background disk activity the rest of the time. For most people with an older hard-drive-based PC who rarely search for files and just want a smoother everyday experience, that trade is well worth making.
Alternative: rebuilding rather than disabling
If search has become unreliable or slow rather than simply consuming background resources, it's sometimes worth rebuilding the index instead of disabling it outright. From Indexing Options, click Advanced, then Rebuild under the Troubleshooting section. This clears out a potentially corrupted index and starts fresh, which can resolve both slow searches and unexpected background disk activity without giving up indexing altogether.
Tip: A rebuild can take a while to complete in the background on a large, slow drive, so it's best started before you go to bed or step away from the PC for an extended period.
Whether you choose to limit, rebuild, or fully disable indexing, the overall goal is the same: reducing unnecessary background disk activity so an older hard-drive-based PC spends its limited speed on what you're actually doing, rather than constantly cataloguing files in the background.
Frequently asked questions
- Will disabling indexing break Windows Search entirely?
- No, search still works after disabling indexing; it simply searches files directly each time rather than instantly, which takes a little longer.
- Should I disable indexing on a laptop with an SSD?
- Generally no, since SSDs handle the constant read/write activity from indexing easily and you'll get much less benefit from turning it off.
- Can I re-enable indexing later if I change my mind?
- Yes, return to Services, set Windows Search back to its previous startup type (usually Automatic), and start the service again.