Three days prior to release, the colocation network facility had a bad fiber optic cable. This failure reduced the player capacity of the server cluster, from 10,000 players down to only 1200 players. As a temporary workaround, Playnet set up multiple copies of the game-world on different servers, distributing the network load, but at some cost in game play. This solution lasted for several months while the developers resolved the server-side issues, after which all servers were merged into a single game-world.

WWIIOL online uses a ½ scale map of Western Europe with 30,000 km² of accurate terrain (800 m resolution satellite data). It is commonly recognized as the first MMOFPS.

The damage model in WWIIOL is more complex than surface appearance indicates. Several critical components within each vehicle are modeled, and often interact. For example, if a radiator is punctured, it may boil off its coolant, causing the engine block (an independent critical component) to seize. Damaged components also provide feedback into the flight or ground simulation model; for aircraft, damage to flight surfaces will result in increased drag and reduced performance of the vehicle. Armor is placed in all vehicles to protect these components, with historically accurate detail on armor angle and thickness

The ballistic model is also detailed, taking into account drag coefficient properties, muzzle velocity, and mass of each individual type of ammunition. For instance, High Explosive (HE) rounds typically travel a shorter distance than Armour Piercing (AP) shells, when fired from the same cannon, due to higher drag coefficient and lower mass