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そんなに速く

that fast

→ そんな
phrase Rare #26,717
that fast Used to describe an action happening to such a high degree of speed, often translated as “so fast” depending on context.
JA: そんなに速く食べないで。
EN: Don't eat so fast.

私はそんなに速く話すことができない。

I can't speak that fast.

そんなに速く話さないで下さい。

Please don't speak so fast.

そんなに速く歩くな。

Don't walk so fast.