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One missing index turned a 40ms query into a 12-second one

 Level Up Coding

The query had run fine for two years. It joined orders to customers on a foreign key, filtered by date range, and came back in under 40… Continue reading on Level Up Coding

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Shopify Just Ditched React Native — and It Has Almost Nothing to Do With Performance

 Level Up Coding

Shopify is rewriting its apps from React Native back to native Swift and Kotlin. 1,275 points and 957 comments on Hacker News later, the… Continue reading on Level Up Coding

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How do you give local content in a WKWebView a real https origin? (iOS 17)

 Level Up Coding

On September 16 I opened a test widget on my iPhone. At the top, a quote that loads when the widget opens. Under it, two text areas and a Compare button that returns a similarity score. Two calls to t...

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