Guild Wars 2 stuttering

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What steps will reproduce the problem?
1. Load GW2 with uMod 'connected', using any of the 3 methods
2. Walk around in game or zoom in and out of the world map using scroll
3.

What is the expected output? What do you see instead?
The FPS does not drop but the game has small freezes for around an 1/8 of a 
second, this happens at least once every minute, there are also smaller freezes 
which happen more frequently but are less noticable. 

What version of the product are you using? On what operating system?
Using version 1.0 on windows 7 

Please provide any additional information below.
I also have experienced freezing issues with uMod, where the program locks up 
completely and has to be 'reinstalled'. This is probably why I am using v1.0. 

Original issue reported on code.google.com by [email protected] on 9 Aug 2013 at 4:39