Quick answer: High ping means a long round-trip time between the player and the server, dominated by physical distance to the server (the single biggest factor), network routing, and the player's connection quality. The most effective fix is server location, provide regional servers so players connect to a nearby one, dramatically cutting ping. Combine with efficient netcode and routing improvements, and design the game to tolerate the ping variability players will always have.
High ping makes multiplayer feel laggy and unfair, and unlike some performance issues, a big part of ping is physics: data takes time to travel, and distance is the dominant factor. The most impactful fix is usually infrastructural, getting servers closer to players, because you can't beat the speed of light, but you can shorten the distance data travels.
What Drives High Ping
Ping is round-trip latency to the server, and its biggest driver is physical distance: data travels at finite speed, so a player far from the server (different continent) inherently has high ping, no software fix changes that. Beyond distance: network routing, inefficient routing between the player and server adds latency beyond the raw distance. Connection quality, the player's own connection (congestion, wifi, mobile) adds latency and variability. And server-side factors, an overloaded server can add processing latency.
Because distance dominates, high ping is often a server-location problem, players are too far from the server. This is why the most effective ping fix is usually moving the server closer (regional servers) rather than optimizing code, the distance is the bottleneck, not the software.
How to Diagnose It
Look at ping in relation to player location and server location. If players far from your server have high ping and nearby ones don't, it's distance/server-location, the dominant case. Check whether you have servers near your player regions or just one central location. Distinguish raw high ping (consistently high, distance) from ping spikes (intermittent, connection quality or congestion). Measure ping across your player regions to see who's underserved.
Bugnet captures reports and performance context, so high-ping complaints and their correlation with player regions surface, if players in certain regions consistently report high ping, that's a server-location gap for those regions. This regional pattern is the key signal that the fix is infrastructural (servers closer to those players) rather than purely code.
How to Fix It
Get servers closer to players, the biggest lever. Provide regional servers (or use a hosting provider with multiple regions) so players connect to a nearby server, which dramatically cuts ping for players who were far from a central server, this is the single most effective fix for distance-driven high ping. Route players to their nearest/best server. Improve routing where possible (good network providers, sensible routing). Make netcode efficient so you're not adding avoidable latency on top of the network ping.
And design for ping you can't eliminate, since some players will always have higher ping (and variability), use latency-hiding netcode (prediction, interpolation, lag compensation) so the game feels acceptable even at higher pings, and consider ping-based matchmaking (match players with similar/low ping to a server) for fairness. After adding regional servers, verify ping drops for the previously-underserved regions. The combination, servers near players plus latency-tolerant netcode, is what delivers low, fair ping across a geographically spread player base.
High ping is mostly distance, you can't beat the speed of light, but you can shorten it. Put servers near players (regional servers), then use latency-hiding netcode for the rest.