Intel B65 GPU sees 30% speed boost with larger vLLM chunk sizes

By PulseAugur Editorial · [1 sources] · 2026-10-22 17:28

A user has shared performance improvements for the Intel B65 GPU when running the flash-next vLLM engine. By increasing the prefill chunk size from the default of 1024 to 8192, they observed approximately 30% faster prefill and time-to-first-token (TTFT). While larger chunk sizes can introduce pauses and reduce the total number of simultaneous sessions, the user found these pauses unnoticeable in their testing with chat and agent tasks, leading them to maintain the larger chunk size for improved end-to-end task completion. AI

IMPACT Optimizations like increased chunk sizes can improve inference speed and efficiency for local LLM deployments.

RANK_REASON User-driven performance tuning and benchmark of existing hardware and software components.

Read on r/LocalLLaMA →

AI-generated summary · Google Gemini · from 1 sources. How we write summaries →

Intel B65 GPU sees 30% speed boost with larger vLLM chunk sizes

How we ranked this

Signal score: 0 / 100; Composite score across the factors below. Higher = stronger signal that this story matters right now.
Newsworthiness bucket: Tool; User-driven performance tuning and benchmark of existing hardware and software components.
Source corroboration: Single-source cluster; Only one publisher covered this so far. Single-source stories can still rank when the publisher is high-authority, but they lack cross-source corroboration.
Topics: infra, product; Editorial topic classification. Feeds into how the story surfaces on /topic/<slug> hub pages and into the per-entity coverage mix.
AI-industry relevance: High; Clearly on-topic for AI-industry coverage.
Story freshness: 12 days old; Aged out of breaking-news scoring windows; ranking reflects the durable signal from the full source set.

Full methodology in our editorial standards.

COVERAGE [1]

r/LocalLLaMA TIER_1 English(EN) · /u/SamSausages · 2026-10-22 17:28

More 4x Intel B65 test results - Performance improvements - ~30% faster prefill and TTFT in flash-next vllm by increasing chunk size. & MPT benchmarks - and a video showing me actually using it in LibreChat.

<table> <tr><td> <a href="https://www.reddit.com/r/LocalLLaMA/comments/1xcoz8s/more_4x_intel_b65_test_results_performance/"> <img alt="More 4x Intel B65 test results - Performance improvements - ~30% faster prefill and TTFT in flash-next vllm by increasing chunk size. & MPT b…

How we ranked this

COVERAGE [1]

More 4x Intel B65 test results - Performance improvements - ~30% faster prefill and TTFT in flash-next vllm by increasing chunk size. & MPT benchmarks - and a video showing me actually using it in LibreChat.

RELATED ENTITIES

RELATED TOPICS