I have two problems.

Every time structures fall on me or someone just destroys a corpse the game gets choppy for a few seconds.
Is there a way i can remove gibs or if there is another fix that would be great

Also what program is required to open the .gm files?

 

There isn't a way to disable gibs, but it was suggested a while back.
And I don't know the answer to your second question.
EDIT: You could always check the box in the audio settings that says "check this if the game is choppy or slow."

 

You can open them with any text editor (including Notepad), but I recommend Notepad++, because you can install custom language styles. You can download a kag .cfg style from here: https://forum.kag2d.com/threads/notepad-language-style-for-kag-cfg-files.7457 and a GameMonkey (.gm) style from here: http://notepad-plus.sourceforge.net/commun/userDefinedLang/userDefineLang_GameMonkey.xml.

 

(Not really sure what you mean by "choppy".)

• Go to KAG\Base\Sprites
• Find the [class]_gibs.png (for each class)
• Move them into another location (if temporarily) or delete them