Speed led lighting Orange

Looks like a 100 Mbps connection.

Try this to confirm:

gate8 # get sys int physical wan1
== [onboard]
==[wan1]
mode: static
ip: 10.10.234.1 255.255.255.0
ipv6: ::/0
status: up
speed: 1000Mbps (Duplex: full)

It depends on your WAN connection whether 100 Mbps would be a bottleneck or not.

Additional info:

gate8 # diag hardware deviceinfo nic wan1
Description :FortiASIC NP6XLITE Adapter
Driver Name :FortiASIC NP6XLITE Driver
Board :80F
lif id :0
lif oid :64
netdev oid :64
Current_HWaddr 94:ff:3c:35:e4:d2
Permanent_HWaddr 94:ff:3c:35:e4:d2
========== Link Status ==========
Admin :up
netdev status :up
autonego_setting:1
link_setting :1
speed_setting :1000
duplex_setting :0
Speed :1000
Duplex :Full
link_status :Up
============ Counters ===========
Rx Pkts :62860210
Rx Bytes :80248730266
Tx Pkts :33334219
Tx Bytes :6885528921
Host Rx Pkts :52872511
Host Rx Bytes :70254983785
Host Tx Pkts :26490746
Host Tx Bytes :3031272405
Host Tx dropped :0
FragTxCreate :0
FragTxOk :0
FragTxDrop :0