Why is the AIM54 Phoenix so slow in acceleration in-game and so fast in DCS?

carrier anti aircraft guns:
https://youtube.com/shorts/cIZh2xbB01k?si=pYoD7lpvXHcBMS1G

sam battery:
https://youtube.com/shorts/ureFePjf4so?si=o-Usic7afuiicezk

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but in DCS you have the option of using the MK60 or MK47 version of the pheonix