LAN speed is slower than internet speed (iperf test)

I have a RT-AC88U connected to internet.

I have been performing the 2 following tests

Both are performed which connected in 5 GHz wifi closed to the RT-AC88U router (Wifi TX Rate >600 Mbps)

Test 1 (between the 2 laptops)
Laptop A (Mac no firewall) 1 is running iperf3 in client mode
Laptop B (Mac no firewall - IP: 192.168.1.135) is running iperf3 in server mode
iperf3 -c 192.168.1.135 -t 20 -R —> 120 Mbits/sec
iperf3 -c 192.168.1.135 -t 20 —> 147 Mbits/sec

Test 2 (from Laptop A to...

LAN speed is slower than internet speed (iperf test)