Hello people, im Fire on the game, and i just learned a way to remove some lag from the game.
I readed all the tutorial here: http://forums.spiralknights.com/node/48
and i pickuped some part from there.
This worked for me:

You will need to try and set Spiral Knights to its minimum display settings:

1. Close Spiral Knights (if it's running).
2. Click on the 'Start' menu and then click on 'Run', or download the pack above \/, so you dont need to do this.
3. Type in "regedit" and hit 'OK': this will bring up the Registry Editor. Warning: Please do not change anything else in the registry since it could cause severe problems.
4. Browse through the registry tree and expand to 'HKEY_CURRENT_USER\Software\JavaSoft\Prefs\projectx'
5. Double-click each of the below registry keys (if present) and type in the corresponding value:

display_mode = 512, 300, 0, 0

Here are other values that may reduce more:

15/16 of default window: 960, 562, 0, 0
7/8 of default window: 896, 525, 0, 0
13/16 of default window: 832, 487, 0, 0
3/4 of default window: 768, 450, 0, 0
11/16 of default window: 704, 412, 0, 0
5/8 of default window: 640, 375, 0, 0
9/16 of default window: 576, 337, 0, 0
1/2 of default window: 512, 300, 0, 0

And the rest... Are insignificant because you wont see anything.

6. Close the Registry Editor and start Spiral Knights.

And thats that!
You will notice some reduction in 1/4 of your window from SK but will definately notcie high reduction from lag.

If you want to get back to the default, just select at the options the resolution you want.

And thats all people, it worked for me, if it wont work for you im sorry.

Previews:
5/8 of default window: http://i51.tinypic.com/1zt10x.png
1/2 of default window: http://i52.tinypic.com/2mww7z4.jpg

And here is an pack, with all the .reg files that automatically changes the resolution if you open this files:
http://www.mediafire.com/?ou4bfbdwdmpyqvp
If you dont trust, then just dont download, and i you trust and want to prove that its working, just say that worked! If you gonna check the files, just open with notepad to see its resource.

If it worked to you please reply!

PS:Just Posting it here because i think no one will see tutorials inside the Support Forum