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Updated: 10-28-12 05:16 AM
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Compatibility:
Warlords of Draenor (6.0)
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:3,164,895
Favorites:1,503
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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, WildStar, Heroes of the Storm, Elder Scrolls Online, Guild Wars 2, Diablo 3, Star Wars: The Old Republic, Rift 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 06-10-09, 11:44 AM  
Leatrix
leatrix.com
Featured Addon Author

Forum posts: 1
File comments: 208
Uploads: 27
Originally posted by Skylinee
You supposedly need a Vista Hotfix before you can use this
The hotfix is included in Windows Vista SP1, which is why SP1 is required for the latency fix to work.
Last edited by Leatrix : 06-10-09 at 01:29 PM.
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Old 06-10-09, 10:04 AM  
Kunstbanause
A Defias Bandit
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Forum posts: 2
File comments: 53
Uploads: 4
I was kinda skeptical.
But..
Before: ~170
After: ~55
... speaks for it self.

The slight delay after pushing a action button is completely gone.
Happy Priest is happy... and casting instants instant finally!

(Vista 64 btw)
Last edited by Kunstbanause : 06-10-09 at 10:07 AM.
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Old 06-10-09, 03:10 AM  
Chobaka
A Kobold Labourer
 
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It works nice.

Before: 100-200ms
Now: 40-60ms
OS: WinXP x86 SP3 latest updates installed.
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Old 06-10-09, 02:12 AM  
Mozzi
A Kobold Labourer

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Simply Amazing

Windows 7 x64
Before: 200 - 300
After: 60 - 80

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Old 06-10-09, 12:30 AM  
aceman67
A Theradrim Guardian
 
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Forum posts: 67
File comments: 73
Uploads: 2
OS Windows 7
Before 356 (in Capital Cities)
After 124 (In Capital Cities)

Thank you so much!
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Old 06-09-09, 09:57 PM  
epitome
Premium Member

Forum posts: 6
File comments: 21
Uploads: 0
Just to say thanks for this. I knew how to do this manually before but forgot since (couple of OS reinstalls, change of motherboards etc...) - Latency was typically around 300ms to 400ms before I used this. Now my latency hovers between 30ms and 65ms !
Fantastic stuff as all I need to do now is run your script to make the change !!!

EDIT: Oh and am currently running/using Windows XP SP3 32bit - playing from Europe on EU servers.
Last edited by epitome : 06-09-09 at 10:00 PM.
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Old 06-09-09, 06:01 PM  
XMushroom
A Kobold Labourer

Forum posts: 0
File comments: 28
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So far so good! Ill perhaps post more findings later.

Currently using, Vista32 SP1. I went from 170ms to 80ms.

One fast question without doing a lot of research on my part

all this does is allow more connections? Would be interested to know a little of the registry changes it makes.

Great fix though! Worked great! Ty
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Old 06-06-09, 11:08 PM  
ckramme
Premium Member
 
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Forum posts: 187
File comments: 168
Uploads: 1
My God thats some excellent work Leatrix! Thank you, thank you, thank you.

Operating system: Microsoft Windows 7 RC
Latency before: 280 - 330
Latency now: 44 - 87

Note on the installation. Did as front234 did and used the Windows Script Host to run the script.

Right-click the Command Prompt under Accessories in All Programs.
-or-
Search programs for cmd.exe and right-click.

Choose Run as Administrator.

Go to the folder with the vbscript.

Type wscript.exe "Optimise TCP for reduced latency and faster gameplay.vbs" and press Enter.

Viola! Dancing bananas
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Old 06-04-09, 07:35 AM  
Aisenfaire
A Murloc Raider

Forum posts: 4
File comments: 275
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Operating system: Microsoft Windows XP Service Pack 3
Latency before: 500 - 800
Latency now: 400 - 500

Thank you.
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Old 06-03-09, 04:43 AM  
front243
Premium Member
Premium Member

Forum posts: 29
File comments: 11
Uploads: 0
On Vista I managed to install this using an elevated command prompt (right click and "Run as Administrator"). That's somewhat easier than disabling and enabling UAC.

edit (My experience):

Vista x64 SP2
Before: 100-200ms typical
Now: about 30ms
Last edited by front243 : 06-03-09 at 05:01 AM.
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Old 05-29-09, 06:55 PM  
Kristie
A Kobold Labourer
 
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My ms went from ~250's to <100

I'm using Windows 7 RC1 btw.
__________________
zomgarmory
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Old 05-29-09, 05:23 PM  
Toadstool
A Fallenroot Satyr
 
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Forum posts: 20
File comments: 7
Uploads: 0
Before high 400s to low 500s
Now mid 200s
Location Australia
OS vista

Thank you so much.
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Old 05-29-09, 07:19 AM  
Breener
A Kobold Labourer

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tested this again today just to see.

You can check a few posts down it didn't seem to do anything

Today it lowered my MS from my usual 160-250 down to ~67

old: 160-250
new: 67
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Old 05-29-09, 12:30 AM  
phaned
A Defias Bandit

Forum posts: 2
File comments: 27
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windows vista sp1

went from 200-300ms to 95-125ms.

I've even seen an increase in fps in some places.

Thanks so much!
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Old 05-28-09, 07:49 AM  
Bulbul
A Kobold Labourer

Forum posts: 0
File comments: 1
Uploads: 0
I was very sceptical about this because I was not sure wether it would really help, but after reading through some of the comments, I decided to give it a try.

It changed my latency from 80-100, which was already very enjoyable, to 20 and less. The delay when pressing buttons has significantly lowered and I'm finally able to interrupt casts < 1 sec.
Great work!

I'm using WindowsXp with Sp3.
Last edited by Bulbul : 05-28-09 at 08:07 AM.
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