What Is Squirrel Update? Is It Safe to Disable at Startup?
Squirrel Update is an app updater used by many Windows desktop apps. Usually safe, but it is optional at startup and worth checking.
- Verdict
- Optional at startupIt is usually a legitimate updater for apps built with Squirrel, but most apps still open normally if you disable its startup entry.
- File name
- update.exe
- Platforms
- Windows
- Reviewed
26%
of Kudu Cloud devices start it automatically
100%
of those see a high boot time impact
Anonymous, aggregated data from devices connected to Kudu Cloud. Methodology
What Is Squirrel Update.exe?
Squirrel Update.exe is usually the updater component for Windows apps packaged with the Squirrel framework. Apps such as chat tools, editors and utility apps have used it to install updates, create shortcuts and relaunch themselves after an update.
The file name is generic: Update.exe. That means the name alone does not tell you which app it belongs to. The most useful clue is its file location. A legitimate copy is often stored inside an app's own folder under your user profile, commonly somewhere in AppData\Local\<AppName>. If you see it starting from a temporary folder, Downloads, or an unusual system location, treat that as suspicious.
Kudu Cloud data: it was seen as a startup item on 26% of devices, enabled on 33% of devices that have it, and marked high boot impact on 100% of devices that have it.
Is It Safe?
Usually, yes — if it belongs to a program you recognize and it runs from that program's install folder. Squirrel itself is a legitimate update system, but Update.exe is a very generic name, so you should verify what launched it.
Check the startup entry's command line and file path. Then open the file's Properties in Windows and look for a Digital Signatures tab or other publisher details. The signer should match the app vendor, not "Squirrel" as a company name. If there is no signature, the path looks odd, or you do not recognize the parent app, investigate before keeping it enabled.
Should I Disable It at Startup?
Usually yes, if you want a lighter startup. In most cases this updater does not need to run every time Windows starts for the app itself to work. The usual tradeoff is that the app may check for updates less often, update later, or take a little longer to update when you open it.
If you rely on the app daily and want background updates, you can leave it enabled. Otherwise, disabling the startup entry is generally low risk.
Why Is It Using High CPU or Memory?
The most common reason is that it is checking for updates, repairing shortcuts, or retrying a failed update. It can also loop if the app's install folder is damaged, permissions are wrong, or an older app left behind a broken updater entry.
If usage stays high for more than a few minutes, check which app folder it belongs to. If you no longer use that app, remove the startup entry or uninstall the app. If you still use it, updating or reinstalling the parent app usually makes more sense than repeatedly ending the process.
How to Disable or Remove It
Disable it first rather than deleting files. In Windows, you can disable the startup entry from Task Manager, Settings, or a startup tool such as Kudu. If it returns, the parent app may be recreating the entry.
To remove it fully, uninstall the app that owns that Update.exe. Do not delete random Update.exe files by name alone. Confirm the file path and the app folder first.
If the entry appears in both HKCU and HKLM Run locations, remove or disable the one tied to the app you identified. If you cannot tell what app owns it, investigate the command line and file location before changing anything.
Where Kudu Helps
Kudu's Startup Manager shows whether this entry comes from the current user or all users, and on Windows it shows boot impact so you can see why it matters. You can disable it without deleting the app, then re-enable it later if needed.
Kudu's Performance Monitor can show whether Update.exe is the process actually using CPU or memory right now, and link it back to its startup item. If the file path or behavior looks wrong, Kudu's Malware Scanner can help you check for suspicious persistence.
Frequently asked questions
- Will disabling Squirrel Update break the app?
- Usually no. The app normally still opens and works, but it may not update in the background until you launch it or reinstall/update it manually.
- Why are there multiple Update.exe entries?
- Different apps can each include their own Squirrel updater, all using the same file name. Check the full file path to see which app each one belongs to.
- Is Update.exe from Microsoft?
- Not usually in this case. For Squirrel-based apps, `Update.exe` typically belongs to the app vendor, so the signature and install path should point to that app's folder.
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