[rcxdude]

The performance side is a bit overblown, in that of course performance strongly depends on access patterns and the access patterns strongly depend on what you're actually simulating. ECS can help with performance but it can also hurt: e.g. the devs of factorio, who have a very large simulation, based on their profiling, have found the game is almost entirely memory bandwidth limited, and so an ECS SoA system like is often touted would not work very well, as it's far better to run every system on each entity than it is to feed each entity through each system, and when inevitably different systems care about the same components, the first will almost certainly find the component data in the cache, while the latter almost certainly won't be and results in the same data being loaded from RAM multiple times.