Guides
Make sense of website speed. Then fix it.
Practical guides for site owners, agencies and shop teams. Each one explains the cause first, shows what you can fix yourself and ends with an honest look at where fast.site helps.
New here? Start with what a CDN does01
Basics
The concepts behind a fast site, and how to measure it without fooling yourself.
What is a CDN and does your website need one?
How a content delivery network works, what it caches, what it cannot fix, and how to tell whether your site will benefit.
Read guideHow to measure website speed properly
Lab tests versus real-user data, which tools to use, and how to run a before-and-after comparison you can trust.
Read guideChanging nameservers without downtime: a checklist
What nameservers do, what happens when you change them, and how to move your domain without losing email or DNS records.
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02
Performance
Metrics that matter for visitors and search, and the fixes that move them.
How to reduce TTFB (Time to First Byte)
What TTFB measures, which values are good, and the practical steps that lower it on the server, in the application and at the edge.
Read guideCore Web Vitals explained: LCP, INP and CLS
What the three Core Web Vitals measure, the thresholds Google uses, and the most common fixes for each metric.
Read guideOptimize images for the web: WebP, AVIF and sizing
Choose the right format, size and loading strategy for your images, and understand what WebP and AVIF actually change.
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03
Platforms
Platform-specific causes and fixes for the systems most sites run on.
Why is my WordPress site slow? Causes and fixes
Find out what really slows WordPress down, from hosting and plugins to images and caching, and fix it in the right order.
Read guideSpeed up WooCommerce without breaking cart and checkout
Which WooCommerce pages can be cached, which must stay dynamic, and how to make a store faster without losing orders.
Read guideShopware 6 performance: HTTP cache, CDN and common pitfalls
How the Shopware 6 HTTP cache works, where a CDN helps, and the configuration mistakes that slow storefronts down.
Read guideWordPress CDN: how to choose the right one
The two kinds of CDN for WordPress, what each one caches, and the criteria that matter when you pick a provider.
Read guideShopware 6 CDN: what to cache and what to bypass
How to put a CDN in front of a Shopware 6 storefront: which responses are safe to cache at the edge, how to purge, and how to test it.
Read guideWooCommerce CDN: a setup guide for store owners
How to run a WooCommerce store behind a CDN: cache rules for shop pages, bypass rules for cart and checkout, purging after changes and testing.
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04
Security
What to do when traffic turns hostile, and how to be ready next time.
Website under DDoS attack? What to do right now
How to recognize an attack, what to do in the first hour, and how to protect your site so the next one does less damage.
Read guideDDoS protection for websites: what actually helps
Which protection layers stop which attacks, what your host already covers, and how to set up protection before you need it.
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Give your website 7 days. Let the results decide.
Start with your own domain, your own traffic and a clear understanding of what comes next.