Called yesterday but they simply told that there are many factors affecting the connection speed from interference from other cordless appliances, confirming first client adapter's MIMO N specs, security/encryption setting, etc. Did discuss what we had did exchanged a few days ago but difficult to understand with a Chinese accent seems irritated from the tone of her voice suggesting to look for another product. Anyway, I'll continue wait fore the next F/W update, perhaps it might resolve these.