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Showing posts with the label startup time

How WhatsApp Made Key Transparency Work (And Why It Matters)

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How WhatsApp's Key Transparency Changed the Game for Encrypted Messaging Okay so let's talk about something actually important for once - how WhatsApp made their encryption more trustworthy without making us jump through hoops. You know how every messaging app claims to be "secure" these days? Well WhatsApp actually put their money where their mouth is with this Key Transparency thing. Let me explain why this matters more than you might think. Visual from their tech docs - looks complicated but trust me it's cool The Big Problem Nobody Talks About So we all know WhatsApp uses end-to-end encryption. Great. But here's the sketchy part nobody mentions - how do you REALLY know you're talking to who you think you are? Like, what if: Some hacker swapped the encryption keys without you knowing? There's a middleman reading your messages right now? The app itself got compromised somehow? Scary stuff right? That's where Key Trans...
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DoorDash's iOS Performance Breakthrough: A Case Study in App Optimization

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Let me tell you about the time our iOS app got so slow that users could literally say "I'm hungry" three times while waiting for it to load. Not cool for a food delivery app. Here's the messy, real-world story of how Doordash fixed similar Issue. Our "before" and "after" metrics - that downward slope never looked so beautiful The Wake-Up Call It started when their analytics showed: 4.2 second average cold start time (yikes!) 1 in 3 users tapping repeatedly like that would help App Store reviews saying "slow as molasses in January" Turns out when people want food, they want it NOW. Who knew? What Was Making them Slow After digging in with Instruments (and several nervous breakdowns), they found: SDK Overload: 18 - yes EIGHTEEN - analytics packages loading at launch Storyboard Spaghetti: UI files so big they made Xcode cry Eager Beaver Network Calls: Fetching data we didn't need yet Font Fiasco: ...
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