Why is the delay of 4g router so large?

Why does the 4g router delay so much? There are usually several reasons as follows:

     1. The signal-to-noise ratio is too low. For example, it is affected by the signal of the equipment next door, and there is no good electromagnetic shielding to prevent interference.

     2. There are too many route hops between the machine and the server. Because the transmission speed of optical/electricity is very fast, their propagation time in the physical medium is almost negligible, but the processing time for the router to forward data packets is not negligible. When there are too many routing and forwarding processing in the link between the local machine and the server, the network delay will be obvious.

     3. The 4G router has insufficient network bandwidth. Excluding other factors, if the client and server are directly connected through a router, but the bandwidth is only 10Kbps, but there are multiple applications that need to transmit 200Kbps of data far exceeding the bandwidth at the same time, a large amount of data will be lost at this time, which manifests as response delay. Time.

     4. The 4G router has insufficient processing bandwidth. Excluding other factors, if the client and server are directly connected through a router and the bandwidth is sufficient, but the server's processing capacity is insufficient, it will also cause response delays.