Sped and speeded are both standard inflections of the verb to speed, and neither is more correct than the other. The old rule, purveyed in many English reference books, holds that speeded works only in the past-tense phrasal verb speeded up, but this recommendation is dated. In real-world, 21st-century usage, writers generally use whichever they think sounds best. Speeded is widely used without up, and sped is likewise used both alone and with up. Sped is about three times as common as speeded, though, which suggests that it remains the safer choice.

https://grammarist.com/usage/sped-speeded/