LagFix speeds up slowing Android devices affected by a bug

Martin Brinkmann
May 28, 2013
Apps, Google Android

If your Android device has become slower and slower over the course of weeks you started using it or upgraded it, you may be victim of a TRIM bug affecting the device. TRIM is a command that operating systems use to communicate with Flash memory controllers to notify them about data blocks that are no longer in use so that they can be wiped and re-used.

The lag is caused by miscommunication between the operating system (Android) and the controller so that write operations take longer to complete than they should. Basically, the controller has to find out if write space is available before data gets written which causes the lag.

If you are experiencing issues when you are switching between apps or saving data then your device may be affected by the issue.

The author of LagFix confirms that the issue is present in the following devices: Nexus S., Galaxy Nexus, Nexus 4, Nexus 7, Nexus 10, HTC One X. Other Android 4.0 or higher devices may be affected as well.

How to find out? If you noticed a deterioration in performance then it is likely that your device is affected by the bug. You can also run a benchmark program like Androbench to find out. Look at the Sequential Writes value, if it is very low you may be affected.

Warning: Running LagFix on some Android devices may render them unusable. This is for instance the case for the Samsung Galaxy 2 and the Samsung Galaxy Note. The author of the extension recommends that you run Got Brickbug? on your phone to find out if your phone is not compatible with the application.

The verdict is not always clear unfortunately.

LagFix is a free app for Android devices that requires root access to run. It will run the fstrim command on devices affected by the bug to resolve it for the time being. Note that you do need to run the app regularly to avoid write performance degradation in the future. The pro version comes with an option to schedule the run regularly.


It is usually not necessary to make modifications to the selection. Just hit the run button and wait until the process completes. This may take a couple of minutes. It is important that you do not interrupt it in any way. It is safest to use if you are using an affected phone or device mentioned above.


If your phone's performance deteriorated over time, you may want to give this a try if you are running one of the affected devices. Again, this may break your phone so make sure you can run the app without bricking it before you do. If you are unsure, contact the author or try to find out more about it on the Internet before you run it.


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  1. bruh said on August 18, 2023 at 1:25 pm

    Uhh, this has already been possible – I am not sure how but remember my brother telling me about it. I’m not a whatsapp user so not sure of the specifics, but something about sending the image as a file and somehow bypassing the default compression settings that are applied to inbound photos.

    He has also used this to share movies to whatsapp groups, and files 1Gb+.

    Like I said, I never used whatsapp, but I know 100% this isn’t a “brand new feature”, my brother literally showed me him doing it, like… 5 months ago?

  2. 💥 said on August 18, 2023 at 3:55 pm

    Martin, what happened to those: 12 Comments ( Is there a specific justifiable reason why they were deleted?

    Hmm, it looks like the gHacks website database is faulty, and not populating threads with their relevant cosponsoring posts.

  3. 45 RPM said on August 19, 2023 at 6:29 pm

    The page on ghacks this is on represents the best of why it has become so worthless, fill of click-bait junk that it’s about to be deleted from my ‘daily reads’.

    It’s really like “Press Release as re-written by some d*ck for clicks…poorly.” And the subjects are laughable. Can’t wait for “How to search for files on Windows”.

    1. owl said on August 20, 2023 at 12:51 am

      > The page on ghacks this is on represents the best of why it has become so worthless, fill of click-bait junk…

      Sadly, I have to agree.

      Only Martin and Ashwin are worth subscribing to.
      Especially Emre Çitak and Shaun are the worst ones.

      If intended “Clickbait”, it would mark the end of Ghacks Technology News.
      Ghacks doesn’t need crappy clickbaits. Clearly separate articles from newer authors (perhaps AIs and external sales person or external advertising man) as just “Advertisements”!

      We, the subscribers of Ghacks, urge Martin to make a decision.

  4. chessandonions said on August 20, 2023 at 12:40 am

    because nevermore wants to “monetize” on every aspect of human life…

  5. Frank Rizzo said on August 20, 2023 at 11:52 pm

    “Threads” is like the Walmart of Social Media.

  6. Ashray said on August 21, 2023 at 4:06 pm

    How hard can it be to clone a twitter version of that as well? They’re slow.

  7. Paul(us) said on August 21, 2023 at 5:16 pm

    Yes, why not mention how large the HD files can be?
    Why, not mention what version of WhatsApp is needed?
    These omissions make the article feel so bare. If not complete.

    1. Paul(us) said on August 21, 2023 at 5:18 pm

      Sorry posted on the wrong page.

  8. Marc said on August 21, 2023 at 6:00 pm

    such a long article for such a simple matter. Worthless article ! waste of time

  9. plusminus_ said on August 21, 2023 at 7:54 pm

    I already do this by attaching them via the ‘Document’ option.

  10. John G. said on August 21, 2023 at 11:43 pm

    I don’t know what’s going on here at Ghacks but it’s obvious that something is broken, comments are being mixed whatever the article, I am unable to find some of my later posts neither. :S

  11. Tom Hawack said on August 23, 2023 at 2:28 pm

    Quoting the article,
    “As users gain popularity, the value of their tokens may increase, allowing investors to reap rewards.”

    Besides, beyond the thrill and privacy risks or not, the point is to know how you gain popularity, be it on social sites as everywhere in life. Is it by being authentic, by remaining faithful to ourselves or is it to have this particular skill which is to understand what a majority likes, just like politicians, those who’d deny to the maximum extent compatible with their ideological partnership, in order to grab as many of the voters they can?

    I see the very concept of this as unhealthy, propagating what is already an increasing flaw : the quest for fame. I won’t be the only one to count himself out, definitely.

    1. Tom Hawack said on August 23, 2023 at 2:34 pm

      @John G. is right : my comment was posted on [] and it appears there but as well here at []

      This has been lasting for several days. Fix it or at least provide some explanations if you don’t mind.

  12. Tom said on August 24, 2023 at 11:53 am

    > Google Chrome is following in Safari’s footsteps by introducing a new feature that allows users to move the Chrome address bar to the bottom of the screen, enhancing user accessibility and interaction.

    Firefox did this long before Safari.

  13. Mavoy said on September 16, 2023 at 2:17 pm

    Basically they’ll do anything except fair royalties.

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