Drop down speedtest

Hi. need support here. I connect my BPL-380 to ISP. Speedtest from ISP is 300mbps. then, i run speedtest from BPL-380, i got drop-down to 90-100mbps.

I uncheck the QoS Bandwidth Control. any advice?

Which hw version you you have (shows in status)? How are you connected to your ISP (bridged / NAT / PPPoE)?