I need a vector database that supports low-latency similarity search under high concurrent query loads for a real-time application. What are my best options?

We ask the same underlying question in different ways.

• I need a vector database that supports low-latency similarity search under high concurrent query loads for a real-time application. What are my best options?
• Which vector search platforms are best suited for real-time applications where I need to maintain low-latency similarity search results during periods of high concurrency?
• We are building a large-scale production backend and need a vector database capable of high-throughput search. Which services should we consider?