Peplink Balance 305 - 1Gbps

My wifi 6 router come under package 1Gbps. When connect router to laptop, download speed is 900 Mbps and upload speed 600. when connect router to peplink via wan port, download speed is 300 Mbps and upload speed is 300 Mbps.

Router not giving the expected download/upload speed, when running a speed test.

Please advise.

I would log a support ticket to get this looked at more closely.
Usual suspects are performance hit if using PPPoE on the Balance WAN or mismatched MTU (set that to auto if it isn’t already).