# elias-fano

Published articles for elias-fano.

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## Perplexity Introduces Photon: A Rust-Based Retrieval Engine That Cuts p99 Latency From 800 ms to 65 ms

DevFeed: [Perplexity Introduces Photon: A Rust-Based Retrieval Engine That Cuts p99 Latency From 800 ms to 65 ms](<https://devfeed.tech/articles/perplexity-introduces-photon-a-rust-based-retrieval-engine-that-cuts-p99-latency-from-800-ms-to-65-ms-62485.md>)

Original publisher: [Read original article](<https://www.marktechpost.com/2026/09/30/perplexity-introduces-photon-a-rust-based-retrieval-engine-that-cuts-p99-latency-from-800-ms-to-65-ms/>)

Author: Asif Razzaq

Published: 2026-09-30T08:26:52Z

Content type: news

Language: en

Sources: [MarkTechPost](<https://devfeed.tech/sources/marktechpost.md>)

Topics: [information retrieval](<https://devfeed.tech/topics/information-retrieval.md>), [Rust](<https://devfeed.tech/topics/rust.md>), [Model Routing](<https://devfeed.tech/topics/model-routing.md>)

Tags: [agentic-ai](<https://devfeed.tech/tags/agentic-ai.md>), [ai-infrastructure](<https://devfeed.tech/tags/ai-infrastructure.md>), [ai-shorts](<https://devfeed.tech/tags/ai-shorts.md>), [api](<https://devfeed.tech/tags/api.md>), [applications](<https://devfeed.tech/tags/applications.md>), [artificial-intelligence](<https://devfeed.tech/tags/artificial-intelligence.md>), [editors-pick](<https://devfeed.tech/tags/editors-pick.md>), [elias-fano](<https://devfeed.tech/tags/elias-fano.md>), [enterprise-ai](<https://devfeed.tech/tags/enterprise-ai.md>), [for-devs](<https://devfeed.tech/tags/for-devs.md>), [language-model](<https://devfeed.tech/tags/language-model.md>), [large-language-model](<https://devfeed.tech/tags/large-language-model.md>), [latency](<https://devfeed.tech/tags/latency.md>), [load-balancer](<https://devfeed.tech/tags/load-balancer.md>), [locks](<https://devfeed.tech/tags/locks.md>), [machine-learning](<https://devfeed.tech/tags/machine-learning.md>), [new-releases](<https://devfeed.tech/tags/new-releases.md>), [production](<https://devfeed.tech/tags/production.md>), [retrieval](<https://devfeed.tech/tags/retrieval.md>), [rust](<https://devfeed.tech/tags/rust.md>), [software-engineering](<https://devfeed.tech/tags/software-engineering.md>), [staff](<https://devfeed.tech/tags/staff.md>), [tech-news](<https://devfeed.tech/tags/tech-news.md>), [technology](<https://devfeed.tech/tags/technology.md>)

### AI overview

Perplexity released Photon, a Rust retrieval and ranking engine that now serves production traffic and powers Fast Search in its Search API. The article describes its sharded architecture, index and ranking techniques, and batched asynchronous reads. Perplexity says the previous system had high tail latency, merge spikes, and slow recovery; the provided text ends before describing Photon's measured latency or recovery results.

### Source excerpt

Perplexity has released Photon, an in-house retrieval and ranking engine written in Rust. It replaces an open-source engine Perplexity had forked for its AI-native search stack. Photon now handles retrieval and ranking for all production traffic. It also powers a new Fast Search mode in the Perplexity Search API. Perplexity reports single-call latency of 160 [...] The post Perplexity Introduces Photon: A Rust-Based Retrieval Engine That Cuts p99 Latency From 800 ms to 65 ms appeared first on MarkTechPost.