Major Issue.

So, I entered KAG.. and waited for the game to load, but I noticed that the framerate was terrible, and appeared glitchy. I then waited for a couple of minutes, hoping that it was just the loading part, but the actual log in screen appeared glitchy, along with terrible framerate as well. I'm not sure if it's just I who is having this issue, or what.

 

Without any proper information I doubt anyone could help you. Either your computer is from the 1970s or it runs on coal, maybe you should resupply it.

Seriously, though. I suggest you take a screenshot of the console and send it to a dev, or close some programs on your computer to make the game run faster. Gamebooster can help too.

 

If you're running KAG in linux and in windowed mode, it's a reported bug :http://bugs.kag2d.com/view.php?id=25, quick and dirty fix is running the game fullscreen.