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DeepSeek recently open-sourced DeepSpec, a codebase for training and evaluating speculative decoding draft models, along with the DSpark paper and checkpoints. I wanted to understand what is actually new here, because speculative decoding itself is not new. The older idea is already powerful: use a small draft model to propose tokens, then let the large target model verify them. I explained that foundation in Speculative Decoding Explained. DSpark is interesting because it attacks two practical problems that show up when speculative decoding moves from a paper idea into production serving: ...

Speculative decoding is one of the most important tricks behind fast LLM serving. The basic idea is simple: Use a small fast model to guess several future tokens, then use the original large model to verify those guesses in one pass. If the guesses are right, the large model moves forward by multiple tokens instead of one. If a guess is wrong, the large model corrects it and the system continues. ...

The KV cache is one of those LLM inference terms that sounds simple until someone asks you to explain it from first principles. At a high level, the idea is: During generation, a transformer stores the previously computed key and value vectors, so it does not recompute them for the whole sequence every time it predicts the next token. That is the short answer. But the short answer hides the important part: why keys and values are reusable, why queries are not cached in the same way, and why this matters so much for latency. ...

Every web developer uses Chrome DevTools. We inspect elements, read console logs, watch network requests, throttle CPU, emulate mobile screens, record performance traces, check storage, debug JavaScript, and capture screenshots. Most of that feels like a browser UI. Under the hood, there is a protocol. That protocol is Chrome DevTools Protocol, usually shortened to CDP. CDP is the browser debugging API that lets tools instrument, inspect, debug, and profile Chrome, Chromium, and other Blink-based browsers. Chrome DevTools itself uses this protocol. Many automation and debugging tools also build on it directly or indirectly. ...

Coding agents are useful when they can read code, edit files, run tests, and explain errors. But web development has a problem that does not fit neatly inside the file system: the real bug often lives in the browser. A React component may look fine in code but overflow on mobile. An API call may fail only after a specific login state. A button may be present in the DOM but not clickable. A performance issue may come from layout shifts, long tasks, font loading, image decoding, or network waterfalls. A console error may point to bundled JavaScript that needs source maps to be useful. ...

Originally published on DEV.to as a submission for the Google I/O Writing Challenge. At Google I/O 2026, the loud announcements were easy to spot: Gemini 3.5, Antigravity 2.0, Android agents, AI Studio upgrades, and a lot of new ways to build software with AI. The announcement I kept coming back to was much quieter: WebMCP. The Chrome docs describe it as a proposed open web standard that can be tested locally behind a Chrome flag and explored with demo apps. ...

Firestore has one of the most convenient real-time APIs in web and mobile development. We write a listener: import { collection, onSnapshot, query, where } from "firebase/firestore"; const q = query( collection(db, "messages"), where("roomId", "==", "general") ); const unsubscribe = onSnapshot(q, (snapshot) => { snapshot.docChanges().forEach((change) => { console.log(change.type, change.doc.id, change.doc.data()); }); }); After that, the UI updates whenever matching documents are added, modified, or removed. It feels similar to a WebSocket because the browser receives real-time updates without manually polling. But Firestore listeners and WebSockets are not the same abstraction. ...

Most web applications start with a simple request-response model. The browser asks for something, the server responds, and the connection is done. That model works well for pages, APIs, forms, dashboards, and most CRUD applications. But some features need something different: chat messages that appear instantly live sports scores multiplayer game state collaborative editing cursors trading prices delivery tracking real-time notifications terminal sessions in the browser For these features, repeatedly asking the server “anything new?” becomes wasteful and slow. ...

When a production system fails, the hardest part is often not the fix. The hardest part is knowing where to look. That is the real value of observability. A service without observability feels like a black box. Requests go in, responses come out, and when something breaks we start guessing. With useful telemetry, that black box becomes closer to a glass box: we can see request paths, slow dependencies, errors, queueing, retries, model latency, token usage, and the exact step where a workflow fell apart. ...