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<!doctype html><html lang=en-us><head><meta charset=utf-8><meta http-equiv=x-ua-compatible content="ie=edge"><meta name=viewport content="width=device-width,initial-scale=1,shrink-to-fit=no"><link rel=preload as=font href=/fonts/vendor/jost/jost-v4-latin-regular.woff2 type=font/woff2 crossorigin><link rel=preload as=font href=/fonts/vendor/jost/jost-v4-latin-700.woff2 type=font/woff2 crossorigin><link rel=stylesheet href=/main.f4e82f75f039986a07346a99687f11e3218d588abe9b9daa7d0673b1a7aaee5b689ec69619c26a2962d5a124bed33807d58bd84180c249bbb8eddc33c5ef5baa.css integrity="sha512-9OgvdfA5mGoHNGqZaH8R4yGNWIq+m52qfQZzsaeq7ltonsaWGcJqKWLVoSS+0zgH1YvYQYDCSbu47dwzxe9bqg==" crossorigin=anonymous><noscript><style>img.lazyload{display:none}</style></noscript><meta name=robots content="index, follow"><meta name=googlebot content="index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1"><meta name=bingbot content="index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1"><title>PoW performance - mCaptcha</title><meta name=description content="PoW performance of native and WASM implementations. Does the native implementation have and edge over the WASM library?"><link rel=canonical href=/blog/pow-performance/><meta name=twitter:card content="summary_large_image"><meta name=twitter:image content="/blog/pow-performance/icon.png"><meta name=twitter:title content="PoW performance"><meta name=twitter:description content="PoW performance of native and WASM implementations. Does the native implementation have and edge over the WASM library?"><meta name=twitter:site content="@"><meta name=twitter:creator content="@"><meta property="og:title" content="PoW performance"><meta property="og:description" content="PoW performance of native and WASM implementations. Does the native implementation have and edge over the WASM library?"><meta property="og:type" content="article"><meta property="og:url" content="/blog/pow-performance/"><meta property="og:image" content="/blog/pow-performance/icon.png"><meta property="article:published_time" content="2021-09-01T00:00:00+00:00"><meta property="article:modified_time" content="2021-09-01T15:33:12+05:30"><meta property="og:site_name" content="mCaptcha"><meta property="article:publisher" content="https://www.facebook.com/"><meta property="article:author" content="https://www.facebook.com/"><meta property="og:locale" content="en_US"><script type=application/ld+json>{"@context":"http://schema.org","@type":"BreadcrumbList","itemListElement":[{"@type":"ListItem","position":1,"name":"Home","item":"\/"},{"@type":"ListItem","position":2,"name":"Blogpow Performance","item":"\/blogpow-performance\/"}]}</script><meta name=theme-color content="#fff"><link rel=apple-touch-icon sizes=180x180 href=/apple-touch-icon.png><link rel=icon type=image/png sizes=32x32 href=/favicon-32x32.png><link rel=icon type=image/png sizes=16x16 href=/favicon-16x16.png><link rel=manifest href=/site.webmanifest></head><body class="blog single"><div class="header-bar fixed-top"></div><header class="navbar fixed-top navbar-expand-md navbar-light"><div class=container><input class="menu-btn order-0" type=checkbox id=menu-btn>
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<span class=toggle-dark><svg xmlns="http://www.w3.org/2000/svg" width="20" height="20" viewBox="0 0 24 24" fill="none" stroke="currentcolor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round" class="feather feather-moon"><path d="M21 12.79A9 9 0 1111.21 3 7 7 0 0021 12.79z"/></svg></span><span class=toggle-light><svg xmlns="http://www.w3.org/2000/svg" width="20" height="20" viewBox="0 0 24 24" fill="none" stroke="currentcolor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round" class="feather feather-sun"><circle cx="12" cy="12" r="5"/><line x1="12" y1="1" x2="12" y2="3"/><line x1="12" y1="21" x2="12" y2="23"/><line x1="4.22" y1="4.22" x2="5.64" y2="5.64"/><line x1="18.36" y1="18.36" x2="19.78" y2="19.78"/><line x1="1" y1="12" x2="3" y2="12"/><line x1="21" y1="12" x2="23" y2="12"/><line x1="4.22" y1="19.78" x2="5.64" y2="18.36"/><line x1="18.36" y1="5.64" x2="19.78" y2="4.22"/></svg></span></button><ul class="navbar-nav social-nav order-3 order-md-5"><li class=nav-item><a class=nav-link href=https://github.com/mCaptcha><svg xmlns="http://www.w3.org/2000/svg" width="20" height="20" viewBox="0 0 24 24" fill="none" stroke="currentcolor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round" class="feather feather-github"><path d="M9 19c-5 1.5-5-2.5-7-3m14 6v-3.87a3.37 3.37.0 00-.94-2.61c3.14-.35 6.44-1.54 6.44-7A5.44 5.44.0 0020 4.77 5.07 5.07.0 0019.91 1S18.73.65 16 2.48a13.38 13.38.0 00-7 0C6.27.65 5.09 1 5.09 1A5.07 5.07.0 005 4.77 5.44 5.44.0 003.5 8.55c0 5.42 3.3 6.61 6.44 7A3.37 3.37.0 009 18.13V22"/></svg><span class="ms-2 visually-hidden">GitHub</span></a></li></ul><div class="collapse navbar-collapse order-4 order-md-1"><ul class="navbar-nav main-nav me-auto order-5 order-md-2"><li class="nav-item active"><a class=nav-link href=/blog/>Blog</a></li><li class=nav-item><a class=nav-link href=/community/>Community</a></li><li class=nav-item><a class=nav-link href=/contact/>Contact</a></li><li class=nav-item><a class=nav-link href=/about/>About</a></li><li class=nav-item><a class=nav-link href=/docs/introduction/installing-captcha/>Docs</a></li></ul><div class="break order-6 d-md-none"></div><form class="navbar-form flex-grow-1 order-7 order-md-3"><input id=userinput class="form-control is-search" type=search placeholder="Search docs..." aria-label="Search docs..." autocomplete=off><div id=suggestions class="shadow bg-white rounded"></div></form></div></div></header><div class="wrap container" role=document><div class=content><div class="row flex-xl-nowrap"><nav class="docs-toc d-none d-xl-block col-xl-3" aria-label="Secondary navigation"><div class=page-links><h3>On this page</h3><nav id=TableOfContents><ul><li><a href=#benchmark-tools>Benchmark tools</a></li><li><a href=#results>Results</a><ul><li><a href=#native>Native</a></li><li><a href=#browser>Browser</a></li><li><a href=#firefox>Firefox</a></li></ul></li><li><a href=#conclusion>Conclusion</a></li></ul></nav></div></nav><main class="docs-content col-lg-11 col-xl-9 mx-xl-auto"><article><div class=blog-header><h1>PoW performance</h1><p><small>Posted September 1, 2021 by <a class="stretched-link position-relative" href=/contributors/aravinth-manivannan/>Aravinth Manivannan</a> ‐ <strong>2 min read</strong></small><p><p><small>Last Edited September 1, 2021</small><p></div><p class=lead>We are mCaptcha. We build kickass CAPTCHA systems that give (DDoS) attackers a run for their money. And we do all of this without tracking your users. Oh and did I mention our UX is great?</p><p>mCaptcha uses a
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<a href=https://en.wikipedia.org/wiki/Proof_of_work>proof-of-work(PoW)</a> mechanism
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to rate limit users or potential bots. In order for this to be
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effective, the PoW should be configured properly. The difficulty
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requirement can’t be too high, as it could cause accessibility issues on
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the client-side while at the same time, it shouldn’t be too low, as it
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wouldn’t offer proper protection against bots.</p><p>Malicious bots(the ones that wreak havoc), run native code which is
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capable of running in a multi-threaded context. This creates an unfair
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advantage for crackers using these bots over legitimate users, who
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usually use browsers to access a website.</p><p>I wanted to see how much of an advantage a native program would have
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over our WASM library.</p><h2 id=benchmark-tools>Benchmark tools</h2><p>So I wrote these to compare native and WASM performances:</p><ul><li>Browser benchmark: <a href=https://mCaptcha.github.io/benches>https://mCaptcha.github.io/benches</a></li><li>Native benchmark: <a href=https://github.com/mCaptcha/cli/blob/master/scripts/bench.sh>mCaptcha/cli managed by scripts/bench.sh</a></li></ul><div class="alert alert-warning d-flex" role=alert><div class="flex-shrink-1 alert-icon">⭐</div><div class=w-100>Feel free to reproduce the results!</div></div><h2 id=results>Results</h2><p>The tests were run on my development machine featuring an Intel Core
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i7-9750h.</p><h3 id=native>Native</h3><table><thead><tr><th>Difficulty</th><th>Real</th><th>User</th><th>Sys</th></tr></thead><tbody><tr><td>500000</td><td>0m0.220s</td><td>0m0.197s</td><td>0m0.006s</td></tr><tr><td>1000000</td><td>0m0.203s</td><td>0m0.203s</td><td>0m0.000s</td></tr><tr><td>1500000</td><td>0m0.198s</td><td>0m0.198s</td><td>0m0.000s</td></tr><tr><td>2000000</td><td>0m0.203s</td><td>0m0.203s</td><td>0m0.000s</td></tr><tr><td>2500000</td><td>0m0.758s</td><td>0m0.752s</td><td>0m0.003s</td></tr><tr><td>3000000</td><td>0m0.776s</td><td>0m0.769s</td><td>0m0.003s</td></tr><tr><td>3500000</td><td>0m2.010s</td><td>0m1.998s</td><td>0m0.000s</td></tr><tr><td>4000000</td><td>0m2.038s</td><td>0m2.033s</td><td>0m0.003s</td></tr><tr><td>4500000</td><td>0m2.014s</td><td>0m2.013s</td><td>0m0.000s</td></tr></tbody></table><h3 id=browser>Browser</h3><p>I ran the tests on both Firefox and Chromium to compare results</p><h3 id=firefox>Firefox</h3><ul><li><strong>User Agent:</strong> <code>Mozilla/5.0 (X11; Linux x86_64; rv:91.0) Gecko/20100101 Firefox/91.0</code></li><li><strong>Hardware concurrency:</strong> 12</li></ul><table><thead><tr><th>Difficulty</th><th>Duration(in ms)</th></tr></thead><tbody><tr><td>500000</td><td>401</td></tr><tr><td>1000000</td><td>413</td></tr><tr><td>1500000</td><td>398</td></tr><tr><td>2000000</td><td>394</td></tr><tr><td>2500000</td><td>1495</td></tr><tr><td>3000000</td><td>1556</td></tr><tr><td>3500000</td><td>3971</td></tr><tr><td>4000000</td><td>4235</td></tr><tr><td>4500000</td><td>4116</td></tr></tbody></table><blockquote><p>To be fair, my Firefox installation is loaded with a gazillion
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extensions while the Chromium instance is clean, as I don’t use it
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much</p></blockquote><h4 id=chromium>Chromium</h4><ul><li><strong>User Agent:</strong> <code>Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/92.0.4515.159 Safari/537.36</code></li><li><strong>Hardware concurrency:</strong> 12</li></ul><table><thead><tr><th>Difficulty</th><th>Duration(in ms)</th></tr></thead><tbody><tr><td>500000</td><td>399.40000000037253</td></tr><tr><td>1000000</td><td>354.6000000014901</td></tr><tr><td>1500000</td><td>351.19999999925494</td></tr><tr><td>2000000</td><td>353.80000000074506</td></tr><tr><td>2500000</td><td>1337.800000000745</td></tr><tr><td>3000000</td><td>1311.199999999255</td></tr><tr><td>3500000</td><td>3417.5999999996275</td></tr><tr><td>4000000</td><td>3488.800000000745</td></tr><tr><td>4500000</td><td>3458.2999999988824</td></tr></tbody></table><h2 id=conclusion>Conclusion</h2><p>At the highest difficulty factor, the native implementation was a almost second
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faster than the WASM library. But the fact that both of them were able
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to run to completion in under 5 seconds is impressive!</p><p>So, in my opinion, native implementation is only slightly faster than
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the WASM library and for all intents and purposes, this shouldn’t matter
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much.</p><hr><p>P.S Work is underway to benchmark multiple platforms. A detailed report
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will be published when that data is available.</p><p>For this post, I asked some of my friends to run the tests on their
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computers. The results slightly varied but even the slowest case
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generated proof for 4500000 difficulty(the highest in this test), in under
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15 seconds!</p></article><div class="docs-navigation d-flex justify-content-between"><a href=/blog/survey/><div class="card my-1"><div class="card-body py-2">← Survey</div></div></a><a class=ms-auto href=/blog/say-hello-to-mcaptcha/><div class="card my-1"><div class="card-body py-2">Say hello to mCaptcha →</div></div></a></div><p class=edit-page><a href=https://github.com/mCaptcha/website/blob/master/content/blog/pow-performance/index.md><svg xmlns="http://www.w3.org/2000/svg" width="16" height="16" viewBox="0 0 24 24" fill="none" stroke="currentcolor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round" class="feather feather-edit-2"><path d="M17 3a2.828 2.828.0 114 4L7.5 20.5 2 22l1.5-5.5L17 3z"/></svg>Edit this page on GitHub</a></p></main></div></div></div><footer class="footer text-muted"><div class=container><div class=row><div class="col-lg-8 order-last order-lg-first"><ul class=list-inline><li class=list-inline-item>Powered by <a href=https://gohugo.io/>Hugo</a>, and <a href=https://getdoks.org/>Doks</a></li></ul></div><div class="col-lg-8 order-first order-lg-last text-lg-end"><ul class=list-inline><li class=list-inline-item><a href=/about/>About</a></li><li class=list-inline-item><a href=/donate>Donate</a></li><li class=list-inline-item><a href=/privacy-policy/>Privacy</a></li><li class=list-inline-item><a href=/security>Security</a></li><li class=list-inline-item><a href=https://stats.uptimerobot.com/GK7VLFJnBl>Status</a></li><li class=list-inline-item><a href=/support/>Support</a></li><li class=list-inline-item><a href=/thanks>Thanks</a></li><li class=list-inline-item><a href=/tos>ToS</a></li></ul></div></div></div></footer><script src=/main.min.993b2b4c58b07e7a4bb3423cf18ccd78a85d0063680c0fc9bf6d9cc02be98e08793034d984dd8f7c60ad5b70f3186cc8bc280b1077b7e37c2d64f36f118099bb.js integrity="sha512-mTsrTFiwfnpLs0I88YzNeKhdAGNoDA/Jv22cwCvpjgh5MDTZhN2PfGCtW3DzGGzIvCgLEHe343wtZPNvEYCZuw==" crossorigin=anonymous defer></script><script src=/index.min.7d5d1ca710ea94116971c4f9b5d605926d6787458c6db6a8692e7e43552c36a15900b49fcf046f4201b11961d77342063a73a6d585b7ca1c6ea1efbbb157e8b4.js integrity="sha512-fV0cpxDqlBFpccT5tdYFkm1nh0WMbbaoaS5+Q1UsNqFZALSfzwRvQgGxGWHXc0IGOnOm1YW3yhxuoe+7sVfotA==" crossorigin=anonymous defer></script></body></html>
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