Why does my Valheim server lag when building large structures?

Lag in Valheim when building large structures on multiplayer servers is a common issue caused by the game''s mechanics and server limitations. Valheim is a procedurally generated survival game that relies heavily on physics and object interactions. When players build large structures, the game must process a significant amount of data, including terrain modifications, object placements, and physics calculations. This can strain both the server and the players'' systems, leading to lag.\n\nOne of the primary reasons for lag is the game''s handling of terrain modifications. Every time you dig, raise, or flatten terrain, the game saves these changes. Over time, these modifications accumulate, especially in areas with extensive building projects. For example, if you''re constructing a massive castle in the Meadows biome, the server must constantly update and sync these terrain changes with all connected players. This can cause delays and stuttering, particularly if the server hardware is not robust enough.\n\nAnother factor contributing to lag is the number of objects placed in the world. Valheim tracks every item, from simple wooden walls to intricate furniture. Large structures often involve hundreds or even thousands of individual pieces. For instance, building a longhouse with detailed interiors in the Black Forest biome can quickly increase the object count. Each object requires memory and processing power, and if the server or players'' systems are near their limits, lag becomes inevitable.\n\nTo mitigate lag, start by optimizing your server settings. If you''re hosting a dedicated server, ensure it has sufficient RAM and CPU resources. Valheim recommends at least 4GB of RAM for small servers, but larger builds may require 8GB or more. Additionally, close unnecessary background applications on your computer to free up resources. If you''re using a third-party hosting service, consider upgrading to a higher-tier plan with better performance.\n\nAnother practical solution is to reduce the number of terrain modifications. Instead of flattening large areas, try building on natural terrain or using raised earth walls to minimize changes. For example, in the Plains biome, you can use the existing flat terrain to your advantage. Additionally, avoid over-decorating interiors with too many small items like trophies or furniture. Each item adds to the object count, so prioritize functionality over aesthetics in large builds.\n\nFinally, consider splitting large projects into smaller sections. Instead of building a massive fortress all at once, focus on completing one section at a time. This reduces the strain on the server and allows players to enjoy smoother gameplay. For example, if you''re constructing a Viking longship dock in the Ocean biome, start with the dock itself before adding detailed decorations or additional structures nearby.\n\nIn summary, Valheim server lag during large builds is caused by terrain modifications, high object counts, and server limitations. To reduce lag, optimize server resources, minimize terrain changes, and avoid overloading the world with too many objects. By following these steps, you can enjoy smoother multiplayer gameplay while creating impressive structures in Valheim.