I've been having lot of issues with Spiral Knights compatibility mode, and all the topics I make about it it never gets fixed! My laptop has 2 nivida graphics cards, but it seems to have a real hard time with this game. I've provided some screenshots to help people understand whats going on.
EXHIBIT A: All Spookats
http://s18.postimg.org/d3iz087c9/examplea.png
On the left we have a spookat with compatibility mode turned off, and on the right it's turned on, see how much smoother the texture is on the right?
EXHIBIT B: All Dust Bunnies
http://s24.postimg.org/fvq67waad/example2.png
On the left we have compatibility mode turned ON, and on the left it's turned off, it's either black ears and whiskers, or no ears at all.
Here are my options to clarify: http://s15.postimg.org/n5nllia1n/options.png
I dunno what to do, it's tiny things like these that really get under my skin.
1. Check that you have the latest java version installed (7u40), and that SK is using it (you get this from the launcher.log file)
2. Make sure you have the latest driver version, and if they do it, try beta drivers
3. If all else fails, install the JDK of java, and see if that improves anything
that's all that I can help with.