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Well, I did a little research on this, because of how convoluted the Street Fighter realm gets. Now, the article that I linked doesn't say Street Fighter 4 as it says Super Street Fighter 4 Arcade Edition, which is a completely separate game from Street Fighter 4 and Super Street Fighter 4... :|.
Based on what I can tell from Wikipedia's
Street Fighter 4 and
Super Street Fighter 4 entry, it looks like the company
Dimps worked on the PC port alongside (?) Capcom. However, they're also listed in Super Street Fighter 4: Arcade Edition as a PC developer alongside QLOC.
So, what I mean is that I was curious how Super Street Fighter 4: Arcade Edition's port is as that was the one mentioned in the article. I'm not sure if that's what you guys mean as there are way too many Street Fighter games with little distinction... and no one is ever surprised by this.
Does it have slowdown? I didn't notice any in the 360 version.