What will be the delay between players on average and in the worst case?

The delay between players depends on many factors: network, server architecture, data exchange protocol, and players' geographical location.

On average, the delay (ping) between players on a local network or with a good internet connection is usually from 20 to 100 ms.

In the worst case — with a poor connection, large distance, or overloaded servers, the delay can reach several hundred milliseconds (300-500 ms and above), which significantly affects gameplay.

To minimize delays, the following are used:

• Using UDP instead of TCP for transmitting game data.
• Geographically distributed servers (regional).
• Optimization of protocols and synchronization algorithms.

Example: if players are in the same city, the delay can be about 30 ms, and if one player is in Europe and another in the USA — the delay can increase to 150-200 ms.