Hi @nikovalchanov,   What is the link negotiation speed of WAN 1? If you hover around the WAN port it will show you the current speed. If the negotiation is downshifted to 100 Mbps for some reason you might see a drop in throughput, so I would start with tshooting Layer 1 first. Also, questions from @double_virgule will help isolate the issue further. ... View more