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そんなに速く

that fast

→ そんな
phrase Rare #27,744
that fast そんなに means “that” or “so much,” and 速く means “fast”; the phrase describes the speed of an action.
JA: そんなに速く食べないで。
EN: Don't eat that fast.

私はそんなに速く話すことができない。

I can't speak that fast.