People using G3258, which dolphin version are you running?

[ZL580]

That's a common occurrence, just 1st time texture loads. Your talking about the sparkles when brawl characters appear? You will notice that if you play the same stage again with the same characters that stutter will be gone. Every time you upgrade to a new build it will give you this stutter, but again everyone has it and its just something we deal with.

Im running at 4.4 and get the same hiccup