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News
How to Bulk Download Images: From URL Lists to a ZIP File
4+ hour, 45+ min ago (1250+ words) The most useful starting point is a list of direct image URLs. Once you have that list, you can download the files together with a browser tool or a small command-line workflow. This tutorial covers both approaches, plus a JavaScript…...
The database connection pool was configured with 50 connections, so why did the 20th request time…
6+ hour, 58+ min ago (30+ words) The database connection pool was configured with 50 connections, so why did the 20th request time out? Understanding how parallel database queries inside a single HTTP request can exhaust your …...
Our users’ phones were the backup: rebuilding a lost database from app caches
7+ hour, 45+ min ago (223+ words) How expired cache entries on readers’ devices, server logs, and a year-old dump were merged back into MongoDB without …...
7 numbers from 8.1 million pull requests that explain why your team feels slower
8+ hour, 33+ min ago (32+ words) LinearB benchmarked 8.1 million PRs across 4,800 organizations in 42 countries. I review code for less experienced …...
Prompt Caching: Why cache_control Writes But Never Reads
13+ hour, 29+ min ago (457+ words) I turned on prompt caching for an agent loop that resends a 12K-token system prompt on every turn. Obvious win, right? Input tokens are the whole bill in a tool loop. The bill went up. Not a little. Roughly a…...
Your app went viral. Adding servers made it worse. Here's why.
13+ hour, 27+ min ago (94+ words) It's midnight, someone huge shares your app, 100,000 people show up — and the page dies. You add three servers. It gets worse. The rule that finally made this click for me: before you add capacity, find out where the request is…...
Tokenization Is Not a Preprocessing Step. It’s a System Design Decision.
11+ hour, 44+ min ago (281+ words) Introduction At some point almost every LLM engineer hits one of these: A “128k context window” model runs out of …...
Valkey 9.1 vs Redis 8.4: The Fork Finally Grew Up
18+ hour, 14+ min ago (456+ words) Back in March 2024, when Redis changed its license, the advice most teams got was simple: wait and see. Valkey, the Linux Foundation fork, was brand new. It was essentially Redis 7.4 with a different governance badge, and nobody wanted to migrate…...
The Real Cost of Web3 Compute Is Data Gravity 🛑
15+ hour, 6+ min ago (40+ words) Compute is becoming increasingly flexible in Web3. You can spin up new instances, move workloads between providers, or choose cheaper GPUs when …...
Why Asynchronous Data Processing Matters in Modern Web Architecture
19+ hour, 41+ min ago (237+ words) When designing web applications that handle real-time interactions, synchronous request handling often becomes a performance bottleneck. Blocking operations—such as third-party API lookups, document formatting, or media rendering—slow down the main thread and degrade the user experience. Decoupling resource-heavy…...