What exactly is "faster" to you?
I just upgraded today as well (not clean install), on the "series 1" MacBook 12 but it seems it will be just as snappy as El Cap (MDS/Finder is indexing now so is using up some CPU)
I'll see about mission control with external monitor... so far so good
EDIT: maybe with the slightly slower mission control transitions, it will be even more snappy...?
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Still, I'm very impressed how everything is just as good as before install. It took me some time to overcome trauma from my Windows days, when software upgrades tended to always slow things down, instead of making things better...