--- title: Making SLH-DSA 10x-100x Faster | daily.dev description: A deep-dive into optimizing SLH-DSA (formerly SPHINCS+), the NIST post-quantum signature algorithm, achieving 10x-100x speedups over naive implementations. The... canonical: https://daily.dev/posts/making-slh-dsa-10x-100x-faster-ntqi4h2x5 twitter:card: summary_large_image twitter:site: @dailydotdev og:type: website og:site_name: daily.dev og:title: Making SLH-DSA 10x-100x Faster | daily.dev og:description: A deep-dive into optimizing SLH-DSA (formerly SPHINCS+), the NIST post-quantum signature algorithm, achieving 10x-100x speedups over naive implementations. The... og:url: https://daily.dev/posts/making-slh-dsa-10x-100x-faster-ntqi4h2x5 og:image: https://api.daily.dev/og/posts/NTqI4h2x5.png og:image:alt: Making SLH-DSA 10x-100x Faster og:image:width: 1200 og:image:height: 630 og:locale: en --- > ## Documentation Index > Fetch the complete documentation index at: https://daily.dev/llms.txt > Use this file to discover all available pages before exploring further. # Making SLH-DSA 10x-100x Faster **[Conduition](https://daily.dev/sources/conduition)** · 42 min read · 0 upvotes · 0 comments ## Summary A deep-dive into optimizing SLH-DSA (formerly SPHINCS+), the NIST post-quantum signature algorithm, achieving 10x-100x speedups over naive implementations. The author benchmarks multiple optimization strategies: SHA256 midstate caching (2x speedup), XMSS root tree caching (~14% reduction), SHA-NI hardware acceleration (2.5x), AVX2 SIMD vectorization (4x for signing), CPU multithreading (~40% reduction), and finally Vulkan compute shaders running on CPU and GPU. The Vulkan GPU approach achieves keygen in ~0.16ms and signing in ~2.6ms, approaching ECDSA verification latency. A custom Rust+C implementation called slhvk is released publicly, supporting bulk keygen and bulk verification for maximum throughput. ## Full article daily.dev links to this article rather than hosting it. Read it at the original source: ## Similar posts on daily.dev - [The Great Certificate Size Explosion – IPsec Series, Part 7](https://daily.dev/posts/the-great-certificate-size-explosion-ipsec-series-part-7-qqoeuqaeo) · Cisco · 1 upvotes · 0 comments - [Pruning Hypertrees for the Lax and Lazy](https://daily.dev/posts/pruning-hypertrees-for-the-lax-and-lazy-ztofys6ur) · Conduition · 0 upvotes · 0 comments - [Future-proofing data integrity: Quantum-safe digital signatures in Cloud KMS](https://daily.dev/posts/future-proofing-data-integrity-quantum-safe-digital-signatures-in-cloud-kms-48ecf07wc) · Google Cloud · 2 upvotes · 1 comments - [Why we cannot wait for better post-quantum signature algorithms](https://daily.dev/posts/why-we-cannot-wait-for-better-post-quantum-signature-algorithms-3zasaxenh) · Cloudflare · 1 upvotes · 0 comments - [GNU Nettle 4.0 Released With SLH-DSA Support](https://daily.dev/posts/gnu-nettle-4-0-released-with-slh-dsa-support-5ystsmwni) · Phoronix · 0 upvotes · 0 comments --- Tags: [#rust](https://daily.dev/tags/rust), [#cryptography](https://daily.dev/tags/cryptography), [#vulkan](https://daily.dev/tags/vulkan) [View this post on daily.dev](https://daily.dev/posts/making-slh-dsa-10x-100x-faster-ntqi4h2x5) ```json {"@context":"https://schema.org","@graph":[{"@type":"Organization","@id":"https://daily.dev/#organization","name":"daily.dev","url":"https://daily.dev","logo":{"@type":"ImageObject","url":"https://daily.dev/apple-touch-icon.png","width":180,"height":180},"sameAs":["https://twitter.com/dailydotdev","https://github.com/dailydotdev","https://www.linkedin.com/company/daily-dev-ltd"]},{"@type":"WebSite","@id":"https://daily.dev/#website","url":"https://daily.dev","name":"daily.dev","publisher":{"@id":"https://daily.dev/#organization"},"potentialAction":{"@type":"SearchAction","target":{"@type":"EntryPoint","urlTemplate":"https://daily.dev/search?q={search_term_string}"},"query-input":"required name=search_term_string"}}]} {"@context":"https://schema.org","@type":"TechArticle","headline":"Making SLH-DSA 10x-100x Faster","url":"https://daily.dev/posts/making-slh-dsa-10x-100x-faster-ntqi4h2x5","mainEntityOfPage":{"@type":"WebPage","@id":"https://daily.dev/posts/making-slh-dsa-10x-100x-faster-ntqi4h2x5"},"datePublished":"2026-03-31T12:26:36.624Z","dateModified":"2026-03-31T12:32:23.563Z","description":"A deep-dive into optimizing SLH-DSA (formerly SPHINCS+), the NIST post-quantum signature algorithm, achieving 10x-100x speedups over naive implementations. 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