We're calling on all EU-based Mozillians with iOS or iPadOS devices to help us monitor Apple’s new browser choice screens. Join the effort to hold Big Tech to account!

This site will have limited functionality while we undergo maintenance to improve your experience. If an article doesn't solve your issue and you want to ask a question, we have our support community waiting to help you at @FirefoxSupport on Twitter and/r/firefox on Reddit.

Search Support

Avoid support scams. We will never ask you to call or text a phone number or share personal information. Please report suspicious activity using the “Report Abuse” option.

Learn More

How can I removie the giant hyberfil.sys file to speed up Firefox on 1GB Athlon XP netbook and Win 7 Pro Desktop?

more options

My Athlon, Win XP, 1GB netbook (and also my quad-core, HP, 200GB desktop media pc) have ongoing issues with: - slow boot time up to 5 minutes (!) to get to the Windows desktop, - slowness starting Firefox - and slowness/crashing Firefox - excessive buffering of streaming video of any resolution (HD or "low" quality)

I have done: - Puran Utilities maintenance functions: chk disk, clean disk, defrag, registry clean, registry defrag - yesterday I removed Avast antivirus and disabled Macafee Site Advisor as a test. Performance improved! - firefox indicates "average" health - removed add-ons and extensions on Firefox temporarily - no improvement - Firefox is latest release - Java is working - Adobe Shockwave/Flash are current and working - Speedtest indicates broadband connection is good - excessive startup programs removed from system startup menu

BOTH pcs have enormous hiberfil.sys files and SystemManager indicates initially they max-out resources when starting.

How can I remove that file, without harming the system? I cannot disable hibernate/sleep on the XP (netbook) or on Win 7 Pro (the desktop) systems.

Thanks for ideas.

My Athlon, Win XP, 1GB netbook (and also my quad-core, HP, 200GB desktop media pc) have ongoing issues with: - slow boot time up to 5 minutes (!) to get to the Windows desktop, - slowness starting Firefox - and slowness/crashing Firefox - excessive buffering of streaming video of any resolution (HD or "low" quality) I have done: - Puran Utilities maintenance functions: chk disk, clean disk, defrag, registry clean, registry defrag - yesterday I removed Avast antivirus and disabled Macafee Site Advisor as a test. Performance improved! - firefox indicates "average" health - removed add-ons and extensions on Firefox temporarily - no improvement - Firefox is latest release - Java is working - Adobe Shockwave/Flash are current and working - Speedtest indicates broadband connection is good - excessive startup programs removed from system startup menu BOTH pcs have enormous hiberfil.sys files and SystemManager indicates initially they max-out resources when starting. How can I remove that file, without harming the system? I cannot disable hibernate/sleep on the XP (netbook) or on Win 7 Pro (the desktop) systems. Thanks for ideas.

All Replies (1)

more options

Hibernation and the file you are referring to is a result of having the Windows Hibernation function enabled. To safely remove the file and to discontinue using hibernation, follow the link below:

Delete Hiberfil.sys...