From the NordicCDN blog
Performance, caching, security and the craft of running a fast website or webshop.
How to purge your CDN cache (and when you actually should)
Purging is the big red button of CDNs: it clears the cache so changes show up now. Useful, occasionally necessary, and easy to over-use — often as a substitute for fixing the actual problem.
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Cache-Control headers: the only guide you'll actually need
Cache-Control decides what gets cached, by whom, and for how long. It looks cryptic and is mostly six words you actually use. Here they are, plus the one distinction that trips everyone.
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Multilingual SEO: hreflang, subfolders and not shooting yourself in the foot
Done right, going multilingual multiplies your search traffic. Done wrong, hreflang gets silently ignored and nobody tells you. Here are the rules and the five ways people break them.
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How to put a CDN in front of your custom domain, step by step
Putting a CDN in front of your own domain is a short checklist and about four places people trip up. Here is the whole thing in order, including how to undo it.
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Flash sales and ticket drops: handling 10× traffic gracefully
A flash sale is a traffic spike with a stopwatch on it — and a second problem most scaling advice ignores entirely: there is only so much stock, and everyone wants it at the same instant.
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Surviving a traffic spike: how a waiting room keeps your site alive
Sometimes demand simply exceeds what your site can handle — a product drop, a viral moment, a ticket release. A waiting room is the difference between a queue and a crash.
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PrestaShop performance: caching a dynamic shop the right way
PrestaShop gives you a serious shop out of the box, and a serious amount of work per page to go with it. How to make it fast without breaking the dynamic bits.
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Black Friday readiness: making your shop survive the spike
Your shop runs fine for 364 days a year. Then Black Friday arrives, traffic goes 20x, and the wheels come off at the worst possible moment. Here is the timeline that prevents it.
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How to speed up a slow WordPress site (without a single plugin)
WordPress out of the box is slow for boring, fixable reasons. Here is the order to fix them in — highest impact first — by moving work to the edge rather than stacking more plugins on top.
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