Remote KV Cache Latency Bottlenecks in Disaggregated GLM-5.3 Serving
October 14, 2026
Implementing a remote KV tier with LMCache and Valkey for GLM-5.3 (FP8 MoE with MLA) increases 16k-token p99 latency from 3.96s to 17.3s. While remote hits at 0.88s outperform recomputation at 0.31s in specific scenarios, synchronous loading causes queue instability with p99s reaching 83.32s.
HOW THIS AFFECTS YOU
●
builderYou must account for significant tail latency spikes when using remote KV stores for long-context serving.
●
researcherThis highlights the critical trade-off between computation and I/O in disaggregated LLM architectures.