Its named latency or lag:
Lag is a common word meaning to fail to keep up or to fall behind. [1] In real-time applications, the term is used when the application fails to respond in a timely fashion to inputs.[2][3] The most common use regards online gaming when the game doesn't respond in sync with the player's controls, usually due to a slow internet connection, server latency or overworked hardware.
Lag is also often used in reference to video games to describe to the delay (or latency) between an action by a player and the reaction of the game.[4]
In distributed applications (such as MMORPGs), lag is often caused by communication latency, which is the time taken for a sent packet of data to be received at the other end. It includes the time to encode the packet for transmission and transmit it, the time for that data to traverse the network equipment between the nodes, and the time to receive and decode the data. This is also known as "one-way latency". A minimum bound on latency is determined by the distance between communicating devices and the speed at which the signal propagates in the circuits (typically 70–95% of the speed of light in vacuum). Actual latency is often much higher because of packet processing in networking equipment, and other traffic.
The term lag is often also used as a synonym for communication latency.[5] This can be misleading because there can be other causes for the symptom.


Hello everyone!
My question is:
This is not my first game against an opponent in live chess, I have advantage in the game and I lead on time, while my opponent begins to run out of time. And now comes the annoying moment. Suddenly appears in a message on the computer screen "trying to reconnect". And after he does it a few times suddenly my time is alredy ran out and the opponent gets more time than he had,In the end only because of this reason I lost the game. If someone knows why it happened or how to stop this phenomenon,I will be happy and grateful person because it is not fair!
Thank you all!