Team Sonic Racing has seen quite an improvement

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Bristow9091 said:

 it still looks too slow for my liking, although that could be to do with the difficulty it's being played on, I mean, they very easily took and maintained first place the entire race, so who knows.

It does look like it's being played on the equivalent of 50cc or 100cc difficulty. And it doesn't look any slower than MK8 really, to me anyway. If anything I'd say it looks a bit faster.