Optimize ComponentList.GetAll by getting rid of LINQ The combination of recursion and LINQ allocated a lot of garbage in GetAll, this would result in a heap reallocation during many GetAll calls. Removing LINQ yielded a nice performance improvement. Getting rid of the recursion gives another tiny performance improvement, but not big enough to justify the reduction in code readability. I can not show results directly for ComponentList.GetAll, because the function executes too fast after the optimization and is no longer captured by the sample profiler. But here are the improvements for PhysiscsWorld.OnIntersection, which makes heavy use of ComponentList.GetAll internally via InvokeListeners<T>(). Before: Function Name: Sandbox.PhysicsWorld.OnIntersection Number of Functions: 2907 Total time: 9s 406ms 99µs Maximum: 11ms 86µs Top Quartile: 3ms 848µs Average: 3ms 235µs Median: 3ms 176µs Bottom Quartile: 2ms 684µs Minimum: 20µs After: Function Name: Sandbox.PhysicsWorld.OnIntersection Number of Functions: 2779 Total time: 3s 661ms 358µs Maximum: 6ms 971µs Top Quartile: 1ms 552µs Average: 1ms 317µs Median: 1ms 220µs Bottom Quartile: 975µs Minimum: 19µs Related to sbox-deathmatch/issues/104