I made my first multiplayer game but the clients have a noticeable delay ,
what is the best way to reduce that delay ?
First, it depends on the kind of game you’re making. If this game is peer-to-peer, what matters the most is the physical distance between the players that are matched together, so you’ll have to improve how the matchmaking will handle that.
It also depends on the game genre that you have. Fighting games, for example, can use rollback netcode to lessen the effects of latency on the player’s experience. GGPO is a really good open-source project to help you implement rollback: https://www.ggpo.net/
If you’re thinking of using a dedicated server for your game, Edgegap is probably the best solution to reduce latency for your players. They work with containers, so you’ll have to containerize your game before deploying it on their platform. With unity, the process is pretty straightforward. They’ll find the best server location for all your players in any given match and deploy it on your game server instantly on-demand.