Modern Game Engine Architecture: Data-Oriented Design and the ECS Paradigm

Modern games with tens of thousands of dynamic entities on screen demand a level of data processing efficiency that classic Object-Oriented Programming (OOP) can no longer deliver. The Entity Component System (ECS) paradigm emerged as an answer to the limits of hardware memory.

In a data-oriented architecture, entity data is stored side by side in memory (contiguous arrays) rather than scattered across the heap. That maximizes CPU cache hits and avoids the cache misses that are the main enemy of a game's frame rate.

Logic systems can process thousands of physics simulations or character AI routines in parallel using SIMD instructions without the risk of race conditions.

ECS implementations in commercial game engines prove that a hardware-friendly memory layout can deliver extraordinary performance.