Answer to: Why my wifi network speed is slow on Samsung Galaxy J5?I also have the same problem with my tp-link archer C7. I too can only reach 4 Mbps with my J5 (2016). I don't know how to solve this problem, so I have installed my old router dlink dir-655 again. With that router I reach 37 Mbps. I have a 100/10 Mbps connection. Could it be a tp-link archer problem? Anyway, I will use my tp-link archer C7 later, when I buy a new smartphone which will be an ac-smartphone.