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here) and flexible purge handling, despite the difference in termination points.</p><h3>The payoff</h3><p>Our new approach reduced the long tail of the lazy purge, saving 10x storage. Better yet, we can now delete purged content immediately instead of waiting for the lazy purge to happen or expire. This new-found storage will improve cache retention on disk for all users, leading to improved cache HIT ratios and reduced egress from your origin.</p>\n <figure class=\"kg-card kg-image-card \">\n \n <Image src=\"https://cf-assets.www.cloudflare.com/slt3lc6tev37/6B0kVX9Q6qA2JshmcTZSrt/bf74ba1901efbb8ae92e2295b216e762/image1.png\" alt=\"\" class=\"kg-image\" width=\"1554\" height=\"423\" loading=\"lazy\"/>\n \n </figure><p><sup><i>The shift from lazy content purging (</i></sup><sup><i><u>left</u></i></sup><sup><i>) to the new Coreless Purge architecture allows us to actively delete content (</i></sup><sup><i><u>right</u></i></sup><sup><i>). This helps reduce storage needs and increase cache retention times across our service.</i></sup></p><p>With the new coreless cache purge, we can now get a purge request into any datacenter, distribute the keys to purge, and instantly purge the content from the cache database. This all occurs in less than 150 milliseconds on P50 for tags, hostnames, and prefix URL, covering all <a href=\"https://www.cloudflare.com/network/\"><u>330 cities</u></a> in <a href=\"https://blog.cloudflare.com/backbone2024/\"><u>120 countries</u></a>.</p><h3>Benchmarks</h3><p>To measure Instant Purge, we wanted to make sure that we were looking at real user metrics — that these were purges customers were actually issuing and performance that was representative of what we were seeing under real conditions, rather than marketing numbers.</p><p>The time we measure represents the period when a request enters the local datacenter, and ends with when the purge has been executed in every datacenter. When the local data center receives the request, one of the first things we do is to add a timestamp to the purge request. When all data centers have completed the purge action, another timestamp is added to “stop the clock.” Each purge request generates this performance data, and it is then sent to a database for us to measure the appropriate quantiles and to help us understand how we can improve further.</p><p>In August 2024, we took purge performance data and segmented our collected data by region based on where the local data center receiving the request was located.</p><table><tr><td><p><b>Region</b></p></td><td><p><b>P50 Aug 2024 (Coreless)</b></p></td><td><p><b>P50 May 2022 (Core-based)</b></p></td><td><p><b>Improvement</b></p></td></tr><tr><td><p>Africa</p></td><td><p>303ms</p></td><td><p>1,420ms</p></td><td><p>78.66%</p></td></tr><tr><td><p>Asia Pacific Region (APAC)</p></td><td><p>199ms</p></td><td><p>1,300ms</p></td><td><p>84.69%</p></td></tr><tr><td><p>Eastern Europe (EEUR)</p></td><td><p>140ms</p></td><td><p>1,240ms</p></td><td><p>88.70%</p></td></tr><tr><td><p>Eastern North America (ENAM)</p></td><td><p>119ms</p></td><td><p>1,080ms</p></td><td><p>88.98%</p></td></tr><tr><td><p>Oceania</p></td><td><p>191ms</p></td><td><p>1,160ms</p></td><td><p>83.53%</p></td></tr><tr><td><p>South America (SA)</p></td><td><p>196ms</p></td><td><p>1,250ms</p></td><td><p>84.32%</p></td></tr><tr><td><p>Western Europe (WEUR)</p></td><td><p>131ms</p></td><td><p>1,190ms</p></td><td><p>88.99%</p></td></tr><tr><td><p>Western North America (WNAM)</p></td><td><p>115ms</p></td><td><p>1,000ms</p></td><td><p>88.5%</p></td></tr><tr><td><p><b>Global</b></p></td><td><p><b>149ms</b></p></td><td><p><b>1,570ms</b></p></td><td><p><b>90.5%</b></p></td></tr></table><p><sup>Note: Global latency numbers on the core-based measurements (May 2022) may be larger than the regional numbers because it represents all of our data centers instead of only a regional portion, so outliers and retries might have an outsized effect.</sup></p><h3>What’s next?</h3><p>We are currently wrapping up the roll-out of the last throughput changes which allow us to efficiently scale purge requests. As that happens, we will revise our rate limits and open up purge by tag, hostname, and prefix to all plan types! We expect to begin rolling out the additional purge types to all plans and users beginning in early <b>2025</b>.</p><p>In addition, in the process of implementing this new approach, we have identified improvements that will shave a few more milliseconds off our single-file purge. Currently, single-file purges have a P50 of 234ms. However, we want to, and can, bring that number down to below 200ms.</p><p>If you want to come work on the world&#39;s fastest purge system, check out <a href=\"http://www.cloudflare.com/careers\">our open positions</a>.</p><h3>Watch on Cloudflare TV</h3><div style=\"position: relative; padding-top: 56.25%;\">\n <iframe\n src=\"https://customer-rhnwzxvb3mg4wz3v.cloudflarestream.com/8c6878c0b57e93d0024c42caf351107e/iframe?preload=true&poster=https://customer-rhnwzxvb3mg4wz3v.cloudflarestream.com/8c6878c0b57e93d0024c42caf351107e/thumbnails/thumbnail.jpg?time=2s&height=600\"\n loading=\"lazy\"\n style=\"border: none; position: absolute; top: 0; left: 0; height: 100%; width: 100%;\"\n allow=\"accelerometer; gyroscope; autoplay; encrypted-media; picture-in-picture;\"\n allowfullscreen=\"true\"\n ></iframe>\n</div><p></p>"],"published_at":[0,"2024-09-25T00:00 01:00"],"updated_at":[0,"2024-09-27T14:58:10.350Z"],"feature_image":[0,"https://cf-assets.www.cloudflare.com/slt3lc6tev37/59kdx20ZFbCY9AqWfUCsew/feb52e2791c11583c6eaf1f06176f366/image4.png"],"tags":[1,[[0,{"id":[0,"1Cv5JjXzKWKEA10JdYbXu1"],"name":[0,"Birthday Week"],"slug":[0,"birthday-week"]}],[0,{"id":[0,"4gN0ARax0fHxjtZL07THOe"],"name":[0,"Performance"],"slug":[0,"performance"]}],[0,{"id":[0,"5RrjSR5vIOJAfRdT8966hf"],"name":[0,"Cache"],"slug":[0,"cache"]}],[0,{"id":[0,"48r7QV00gLMWOIcM1CSDRy"],"name":[0,"Speed & Reliability"],"slug":[0,"speed-and-reliability"]}]]],"relatedTags":[0],"authors":[1,[[0,{"name":[0,"Alex Krivit"],"slug":[0,"alex"],"bio":[0,null],"profile_image":[0,"https://cf-assets.www.cloudflare.com/slt3lc6tev37/1e9gtWsffhoAWG0rTN45cR/4acc93f498ebe57bca2563c4c6c0ffc7/alex.jpg"],"location":[0,null],"website":[0,null],"twitter":[0,"@ackriv"],"facebook":[0,null]}],[0,{"name":[0,"Tim Kornhammar"],"slug":[0,"tim-kornhammar"],"bio":[0,null],"profile_image":[0,"https://cf-assets.www.cloudflare.com/slt3lc6tev37/48jH4cWwD5fakrdEvnB67d/acbeacd06bc94ffd597549a834c80f92/tim-kornhammar.jpg"],"location":[0,"Texas, USA"],"website":[0,null],"twitter":[0,null],"facebook":[0,null]}],[0,{"name":[0," Connor Harwood"],"slug":[0,"connor-harwood"],"bio":[0],"profile_image":[0,"https://cf-assets.www.cloudflare.com/slt3lc6tev37/7ChQBYRPNIiEuQnGQdajbt/d11901c93d25d4d82d01274d09a03d8a/_tmp_mini_magick20221017-43-y5gfah.jpg"],"location":[0],"website":[0],"twitter":[0],"facebook":[0]}]]],"meta_description":[0,"Today we’re excited to share that we’ve built the fastest cache purge in the industry. We now offer a global purge latency for purge by tags, hostnames, and prefixes of less than 150ms on average (P50), representing a 90% improvement since May 2022. "],"primary_author":[0,{}],"localeList":[0,{"name":[0,"blog-english-only"],"enUS":[0,"English for Locale"],"zhCN":[0,"No Page for Locale"],"zhHansCN":[0,"No Page for Locale"],"zhTW":[0,"No Page for Locale"],"frFR":[0,"No Page for Locale"],"deDE":[0,"No Page for Locale"],"itIT":[0,"No Page for Locale"],"jaJP":[0,"No Page for Locale"],"koKR":[0,"No Page for Locale"],"ptBR":[0,"No Page for Locale"],"esLA":[0,"No Page for Locale"],"esES":[0,"No Page for Locale"],"enAU":[0,"No Page for Locale"],"enCA":[0,"No Page for Locale"],"enIN":[0,"No Page for Locale"],"enGB":[0,"No Page for Locale"],"idID":[0,"No Page for Locale"],"ruRU":[0,"No Page for Locale"],"svSE":[0,"No Page for Locale"],"viVN":[0,"No Page for Locale"],"plPL":[0,"No Page for Locale"],"arAR":[0,"No Page for Locale"],"nlNL":[0,"No Page for Locale"],"thTH":[0,"No Page for Locale"],"trTR":[0,"No Page for Locale"],"heIL":[0,"No Page for Locale"],"lvLV":[0,"No Page for Locale"],"etEE":[0,"No Page for Locale"],"ltLT":[0,"No Page for Locale"]}],"url":[0,"https://blog.cloudflare.com/instant-purge"],"metadata":[0,{"title":[0,"Instant Purge: invalidating cached content in under 150ms"],"description":[0,"Today we’re excited to share that we’ve built the fastest cache purge in the industry. We now offer a global purge latency for purge by tags, hostnames, and prefixes of less than 150ms on average (P50), representing a 90% improvement since May 2022. "],"imgPreview":[0,"https://cf-assets.www.cloudflare.com/slt3lc6tev37/18ZVwqqO5THZ7TrRFKjxR6/a1609c424549ac26ab7a4b47549cdebb/Instant_Purge-_invalidating_cached_content_in_under_150ms-OG.png"]}]}],"translations":[0,{"posts.by":[0,"By"],"footer.gdpr":[0,"GDPR"],"lang_blurb1":[0,"This post is also available in {lang1}."],"lang_blurb2":[0,"This post is also available in {lang1} and {lang2}."],"lang_blurb3":[0,"This post is also available in {lang1}, {lang2} and {lang3}."],"footer.blurb":[0,"Cloudflare's connectivity cloud protects <a target='_blank' href='https://www.cloudflare.com/network-services/' rel='noreferrer'>entire corporate networks</a>, helps customers build <a target='_blank' href='https://workers.cloudflare.com/' rel='noreferrer'>Internet-scale applications efficiently</a>, accelerates any <a target='_blank' href='https://www.cloudflare.com/performance/accelerate-internet-applications/' rel='noreferrer'>website or Internet application</a>, <a target='_blank' href='https://www.cloudflare.com/ddos/' rel='noreferrer'>wards off DDoS attacks</a>, keeps <a target='_blank' href='https://www.cloudflare.com/application-security/' rel='noreferrer'>hackers at bay</a>, and can help you on <a target='_blank' href='https://www.cloudflare.com/products/zero-trust/' rel='noreferrer'>your journey to Zero Trust</a>.<br/><br/>Visit <a target='_blank' href='https://one.one.one.one/' rel='noreferrer'>1.1.1.1</a> from any device to get started with our free app that makes your Internet faster and safer.<br/><br/>To learn more about our mission to help build a better Internet, <a target='_blank' href='https://www.cloudflare.com/learning/what-is-cloudflare/' rel='noreferrer'>start here</a>. 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