I'll be working with large numbers of objects and want to know when these structures start to experience issues.
For context, I'll be using a 64-bit system with tons of memory. Also, I'll need to find objects using some form or 'key'. Given the performance demands, these objects will need to reside in memory, and many will be long-lived.
Feel free to suggest other approaches/patterns, although I need to avoid using third-party or open-source libraries. For specification reasons, I need to be able to build this using native C# (or C++\CLI).