NSA325V2 very slow write speed

Hi, I just installed a Zyxel NSA325V2 with 2 3tb hdd's in Raid1. Firmware is V4.70(AALS.0). When I test the speed from my M1 Mini Mac to the NAS with AmorphousDiskMark 4.0 to the public folder on the NAS I get following speeds:
Read - 91,25 MB/s and Write - 15,71 MB/s. Any idea why the write speed is so slow ?
Kind regards ... 

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