Balance One and Gigabit Line speeds issue

Hi, i have a Peplink Balance One firmware 7.1.1 build 3775 and have connected a 1 Gigabit leased line
if i run a test directly to the providers NTE the speeds im getting are more than 500-600mb
from the router the speeds i get are 250mb download maximum and 400mb upload maximum

is there any settings i have to adjust or the throughput is limitet to these numbers and i have to go to the next level router (something like Balance 380?)

Any suggestions appreciated

Tolis

Set your WAN MTU on the Balance One to auto and try again.

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unfortunately this didn’t resolve the issue
same speeds still and when connecting the laptop directly the bandwidth is at least 2-3 times higher
any other ideas? firmware?
can the throughput support it? in specs it says 400/600mbps for Balance One
thanks