LiteLLM-Rust Cuts AI Gateway Overhead 150x, Making Agent Memory a Default Feature

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LiteLLM-Rust, a Rust-based rewrite of the popular LiteLLM AI gateway, has reached production in 2026, reducing per-request overhead from approximately 7.5ms to just 0.05ms. The dramatic latency reduction also delivers 15x higher throughput and 11x lower memory usage under sustained load compared to the previous Python-based gateway. Previously, high gateway latency made persistent session memory economically impractical, forcing engineering teams to treat it as an optional or separate service using tools like Redis, Weaviate, and Postgres. With overhead now negligible, developers can enable structured session memory on every agent call by default, backed by a single Postgres store with pgvector, without running multiple synchronised services. The shift effectively repositions agent memory from a costly infrastructure add-on to a standard architectural primitive in AI application design.

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