@Joseph-TP No EasyMesh and the topology is correct. What is "local" support? EDIT: Providing additional context: With Flow Controller On - Note the Buffer Bloat on Upload With Flow Controller Off -...

Experiencing a very similar issue on BE800 V1. I get huge jitter and packet loss and disabling Flow Controller for WAN fixed the issue. Running latest firmware (1.2.4 Build 20250414 rel.18315(5553)).