Lenovo Beacon file transfer too slow

dear all, i'm a newby here and i need your help. I own a Beacon with 2x1TB HDD in RAID 0 mode, so when i move datas to Beacon the max. file trasfer speed is up to 5 mb/s. In my opinion this is tooooo slow. Can anyone help me, or say about your file tranfer speed to Beacon. My configuration: Lenovo Beacon +  Netgear 5-port Gigabit Switch (GS305) + Win7 PC. Everything is LAN wired. I already tryed another PC (Notebook) but with the same result. Thank you!

Beacon use HTTP protocal, and we use Filezilla as benchmark comparison (Note, Filezilla use FTP protocal.)
Test config: Router, Netgear WGR614 V9 with Lan speed 100Mbps, Thinkpad Notebook (win7) wire connected to router, Beacon wire connected to router .
Test Result:  Single file speed 5MBPS, and three files 10MBPS by Beacon; single file 11.6MBPS, multiple files 11MBPS

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