The Fast Startup feature in Windows 10 and 11 has garnered attention due to its ability to significantly reduce boot times. Promoted by Microsoft as a recommended setting, this feature allows users to turn on their PCs more swiftly. But there’s more to it than meets the eye.
While it promises speed, Fast Startup can lead to various complications. By not performing a complete shutdown, it sacrifices a fresh start for your system, which can result in strange glitches, problematic updates, and difficulties with external devices or dual-boot configurations. In short, while Fast Startup enhances speed, it often comes at the expense of stability.
Understanding Fast Startup
The Trick Behind Fast Startup

Fast Startup seems like a straightforward feature that everyone would want to enable for a faster boot. However, its operation is more complex than simply optimizing the boot process. Instead of completely shutting down your system, it employs a method akin to half-hibernation.
During a typical shutdown, Windows closes all applications and logs out the user, ensuring a complete system reset. However, with Fast Startup activated, Windows retains the core system state—the kernel and essential drivers—in a suspended condition. This state is saved to a file called hiberfil.sys. Therefore, when you power your device back on, Windows can quickly restore this state instead of starting from scratch. Despite the faster boot time, the downside is that your PC does not truly shut down — it merely suspends its previous state.
My Experience with Fast Startup
The Cost of Speed

I initially kept Fast Startup enabled because it was the default setting. However, the slight time savings began leading to small yet frustrating complications over time.
These included issues such as incomplete system updates, trouble recognizing external drives after restarts, and erratic behavior from Windows, which occasionally seemed to be acting on outdated information. For example, after upgrading my RAM, I was puzzled by peculiar system behavior until I realized that remnants of the old system state cached by Fast Startup were causing conflicts.
Moreover, if you’re using a dual-boot setup, Fast Startup can lock certain system partitions, rendering them inaccessible to other operating systems like Linux. This can result in potential data corruption, a significant risk that led me to ultimately disable Fast Startup permanently.
How to Disable Fast Startup
Step-by-Step Guide to Disable It
If you find that Fast Startup brings more issues than benefits, deactivating it is quite straightforward. Here’s how you can turn it off:
- Launch the Control Panel via the search menu.
- Select Power Options. You may need to click on Hardware and Sound first if it’s not immediately visible.
- Click on Choose what the power buttons do from the left sidebar.
- Hit the Change settings that are currently unavailable link.
- Uncheck the box labeled Turn on fast startup (recommended) and click Save changes.
Once completed, your computer will perform a full shutdown every time you power it off. Yes, it may take a tad longer to boot up, but you’ll benefit from a clean slate each time, avoiding unforeseen issues stemming from a cached system state.
Alternative Ways to Speed Up Boot Time
Strategies for Improved Boot Speed

Disabling Fast Startup doesn’t mean sacrificing quick boot times. There are smarter, more effective methods to enhance your system’s startup performance.
One of the most impactful changes I made was to reduce the number of startup programs. Many applications—such as cloud storage clients and background utilities—often add themselves to the startup list, contributing unnecessary delays.
You can easily manage these by accessing the Task Manager, navigating to the Startup tab, and disabling any applications you don’t require at boot. Additionally, I took the time to turn off some non-essential background services and scheduled tasks that unnecessarily ran with every startup.
Ultimately, while Fast Startup offers a seemingly appealing speed boost, I opt for a more reliable experience. On systems equipped with SSDs, the difference in boot time following a complete shutdown is negligible, allowing me the peace of mind of a fresh start every time. For users with HDD setups, hibernating may provide a desirable middle ground—offering quicker access while still permitting full system resets when required.
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