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Updated: 10-28-12 05:16 AM
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Compatibility:
Siege of Orgrimmar (5.4)
Escalation (5.3)
Thunder Isle (5.2)
Landfall (5.1)
Mists of Pandaria (5.0.4)
Updated:10-28-12 05:16 AM
Created:05-23-09 01:32 PM
Downloads:3,088,908
Favorites:1,491
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Categories:Leatrix Projects, WoW Tools & Utilities
5.4
Leatrix Latency Fix  Popular! (More than 5000 hits)
Version: 3.00
by: Leatrix [More]
A latency fixing program by Leatrix
Click here to lend your support!
What does it do?

Leatrix Latency Fix will reduce your online gaming latency significantly by increasing the frequency of TCP acknowledgements sent to the game server. For the technically minded, this is a program which will modify TCPAckFrequency.

You will see reduced latency in many online games including World of Warcraft, Guild Wars 2, Diablo 3, Star Wars, Rift, Aion, Warhammer, Lord of the Rings, and more.

Note that Leatrix Latency Fix performs a different modification to the 'Optimise Network for Speed' setting in World of Warcraft. They are not the same thing and can be used together (more information on this in the FAQ).

System Requirements

Leatrix Latency Fix is supported on these operating systems only.
  • Windows 7
  • Windows 8
  • Windows Vista (SP1 or higher)
  • Windows XP (SP3)
Both 32-bit and 64-bit versions of Windows are supported.
Macintosh users should read the guide here.

Installation Instructions

You can watch a short installation video here.

Simply download the zip file, extract it and then run Leatrix_Latency_Fix_3.00.exe. When the program launches, click the Install button. You will see the status change from 'Not Installed' to 'Installed'. You need to restart your computer (or disable/enable your network card) for the changes to take effect.

If you're using Windows Vista or Windows 7 with User Account Control enabled, you will be prompted to confirm that you wish for Leatrix Latency Fix to make changes to your computer.

Your Windows account needs to have Administrator rights in order to install or remove Leatrix Latency Fix. If your Windows account doesn't have Administrator rights, you will be prompted for the credentials of an account that does have them.

After Leatrix Latency Fix has been installed, you can login to your online games with reduced latency!

To uninstall Leatrix Latency Fix, click the remove button and restart your computer.

For reference, the status line in the program will show 3 possible tags. 'Installed' indicates that all network interfaces have been modified for reduced latency. 'Not Installed' indicates that no network interfaces are modified for reduced latency. 'Partially Installed' indicates that some network interfaces have been modified for reduced latency. You will see this status tag if you add a new network card (or perhaps a USB modem) after the installation of Leatrix Latency Fix.

Errors and Unexpected Behaviour

If you have any problems with the program, please click here to send me a message. Include your operating system and service pack as well as any relevant information (such as error messages). You can also try version 2 if you prefer (available here). Version 2 requires the Microsoft.net Framework (available here) but the mechanics are identical to version 3. You can watch a short installation video for version 2 here.

If you are having problems downloading from Wowinterface, please use this link on Dropbox (this link is subject to change so please don't share it elsewhere).

More Information

There is a FAQ covering pretty much everything here and there is a short installation video tutorial here.

To ensure that people always use the genuine Leatrix Latency Fix program, please don't publish it elsewhere. It's completely free so there is no need to. Please link to www.leatrix.com instead.

Links

Some official and unofficial videos and websites referencing Leatrix Latency Fix are listed below. If you have made an honest webpage or video featuring Leatrix Latency Fix and you would like to see it listed here, just send me a private message.

Official Leatrix Sites
Unofficial videos featuring Leatrix Latency FixLinks, fansites, nice people and interesting thingsMore

Visit Leatrix.com for genuine Leatrix software.

Leatrix software is protected by copyright and is ONLY hosted on Leatrix.com and Wowinterface.com. Files hosted anywhere else are NOT genuine and could contain viruses. Stay safe online and use only genuine Leatrix sites.
3.00
  • Leatrix Latency Fix 3.x is written in Python.
  • The Python configuration files are bundled with the download.
  • Integrated Microsoft User Account Control and Administrator rights detection.
  • This update is recommended for new users but optional for existing users.
2.0.2.0
  • Updated exception handling.
2.0.1.0
  • Simplified the code structure.
  • Restarts are no longer done for you so that you can choose whether to restart your computer or network card.
2.00
  • Leatrix Latency Fix 2.x is written in Visual Basic (Microsoft .Net Framework 4 required to run).
1.23
  • Updated the restart process.
1.22
  • To avoid confusion, unknown interfaces will no longer be listed in the checker script.
1.21
  • The checker script will now show network interface names and identify virtual or DHCP addresses correctly.
1.18
  • The checker script will now show IP addresses for the network interfaces which have been modified.
1.15
  • You can now run Leatrix Latency Fix from batch files using 'cscript <script name.vbs>' (eg. 'cscript c:\install.vbs'). Administrator rights are required for this.
1.12
  • Added a checker script which will inform you whether Leatrix Latency Fix is installed or not.
1.11
  • Added support for Microsoft's User Account Control.
1.00
  • First release.
Archived Files (1)
File Name
Version
Size
Author
Date
2.0.2.0
383kB
Leatrix
10-22-12 12:51 PM


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Old 09-30-09, 06:11 AM  
kaikkis
A Kobold Labourer

Forum posts: 0
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nice work

Ok so for me win 7

was 250
now 60

wife windows xp
was 190
now 55


thank you =)
the difference is HUGE!.. feel like in christmas.. haha!
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Old 09-29-09, 08:08 PM  
PsyHeart
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ok i jsut isntalled it again..
my pc started up normally bit faster actually
open my browser, surfed abit around. good speed still still the same
started wow.. and i have to admit.. my latency went down! )
from around 95-130 to around 20-35
could be that it will increase when in peak times tho...
anyway, nice script u made there!
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Old 09-29-09, 09:46 AM  
Yza
A Kobold Labourer

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who's d boss?
Leatrix!
before 150 - 350ms
now after his fix 41 - 75(max) ms @ Dalaran (tonz of ppl)
i had some lag+dc problems in 25m raids, so i hope this fix it too.
Anyway.. thank alot 4 this awsome utility.
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Old 09-27-09, 06:59 PM  
Wimpface
A Molten Giant
 
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Windows XP SP2, went from 2-300 MS to 15-25. This is a godsend, thanks Leatrix.

EDIT: Make that 15-45.
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Last edited by Wimpface : 09-27-09 at 07:00 PM.
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Old 09-27-09, 02:53 PM  
eple
A Murloc Raider
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Working :)

Using Windows 7 64bit, latency went from 190 to 50. Love it
edit: up to 90 now :P
Last edited by eple : 09-27-09 at 02:54 PM.
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Old 09-25-09, 02:07 PM  
LiNK2088
A Murloc Raider

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This realy works, thanks alot!
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Old 09-25-09, 09:13 AM  
Keyzer
A Murloc Raider

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Using Windows 7. Went from 230ms to 50ms. Nice work!
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Old 09-24-09, 02:39 AM  
cawfee
An Aku'mai Servant
 
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Windows 7, down to 120 from 250. Great work!
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Old 09-23-09, 07:03 AM  
Limb0
A Cobalt Mageweaver
 
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Just wanted to chime in, I'm on Vista 32 sp2 and after running an earlier version of Latency Fix (I'm pretty sure it was when you first uploaded it here under a different name), I went from 300-400 ms down to 70-110ms in Dalaran as well as in 25 Man Trials and Uld.

I have a link to LLF on my UI page and often recommend it to guildies and friends. Thanks for helping out the community, it's really appreciated.
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Old 09-22-09, 10:25 AM  
WowRobban24
A Kobold Labourer

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Thumbs up Best ever

DUDE This thing is ****ing awsome ! i running with Vista 64 bit service pack 2 and i had around 260-400 constant ms in ironforge/dalaran etc
now i am on 100-160 constant so YES this is working 100% so all should rly use it to get better Ms Really thanks to you who made this
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Old 09-22-09, 12:03 AM  
thomasjohnshannon
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Re: Latenfy Fix Results

I have only had it for a little bit but I did notice a big drop in ms.

Before: 200ms-250ms
After: 80-90ms
Operating System: Windows Vista SP2
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Old 09-18-09, 03:50 AM  
Mr. Ogi
A Kobold Labourer

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In my case it dropped from 200ms down to 70ms.
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Old 09-14-09, 02:23 AM  
Vafthrudnir
A Kobold Labourer

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from 400 to 80. The cynic in me is telling me that this is too good to be true, but you actually solved all my latency problems in one swift stroke. Thanks a lot.
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Old 09-12-09, 02:00 PM  
Darcdragon
A Kobold Labourer
 
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Before/After

300-400 ms before LLF
140-160ms after LLF
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Old 09-08-09, 11:05 PM  
tralkar
An Onyxian Warder
 
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I went from 240 to 150? better than nothing i quess.
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