From the NordicCDN blog
Performance, caching, security and the craft of running a fast website or webshop.
WebP vs AVIF: which image format should you actually use?
Images are usually the heaviest thing on your page, so the format matters. AVIF squeezes smaller, WebP is everywhere — but the decision most sites should be making is a different one entirely.
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Cache hit ratio: what it is and how to get yours above 95%
It is the one number that tells you whether your CDN is actually doing its job. What it means, the five things that usually wreck it, and how to work out which one is wrecking yours.
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Brotli vs Gzip: which one should your server use?
Both shrink your text before it hits the wire, and both are basically free speed. The honest comparison — which compresses harder, which is faster, and why the answer depends on whether the file is cacheable.
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Core Web Vitals in 2026: LCP, INP and CLS without the jargon
Three acronyms decide a chunk of how Google ranks you and how your site feels to use. Here is what LCP, INP and CLS really measure — and, for each, the change that moves the number most.
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What is a CDN, and do you actually need one?
CDN gets thrown around like everyone already knows what it means. Here is the plain-English version — what it does, how it works, and an honest answer to whether your site needs one.
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Why faster sites convert more — and rank higher
Speed isn't a vanity metric for engineers to fuss over. Every fraction of a second you shave off load time shows up in your conversion rate, your bounce rate and your search rankings. Here is the data — and what to do about it.
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