I'm not sure how it would contribute to lag. For the blasts getting larger, the same animation is already in the game. If someone lagged because Ryu did a Shinku hadouken in desperation, then they'd lag if Cyclops did his super large blast (which is already in the game). So I don't think it'll make the game laggier (than it already is).
Also, they're not really "new moves", they're just changes to existing move. Instead of animation A, it's animation X. Instead of Shinku Hadouken doing damage X, it'll do damage Y. It's just changes, its' far from being an entirely new move.
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