Your question is High-Throughput Data Structures. Take a moment with it on the right.
Talk me through your thinking if you like. When you're confident, submit your answer and I'll grade it like a real screen (7/10 or better passes).
How do you handle data structure fundamentals when optimizing high-throughput data streams?
Explain how you would choose and use data structures while implementing a high-throughput streaming path. Address ordering, memory usage, concurrent producers and consumers, lookup requirements, backpressure, and how you would measure whether a choice improves throughput. Include one concrete implementation example and discuss the trade-offs between at least two suitable data structures.
Keep the answer language-agnostic, but use precise data structure and concurrency terminology.