Overview

Let's be honest: your Python application is slow. You've already done the ""simple fixes."" You've added a database index, optimized a loop, and maybe even pip install-ed a new library that promised magic. And yet, your P99 latency is climbing, your pandas script just OOM-killed another server, and your users are starting to notice. Here's the hard truth: your problem isn't your code; it's your architecture. Python at Scale: Architecting for Speed is not another book of clever ""hacks."" It's a hands-on guide to thinking like a systems architect, for Python developers who have hit the performance wall. We're going ""beyond simple fixes"" to build truly performant, data-intensive systems that are fast by design. In this book, we'll stop tweaking and start re-architecting. You will learn to: Identify the Real Villain: Stop guessing. Learn to use the right profiler (cProfile, Py-Spy, Scalene) to find your actual bottleneck-whether it's I/O wait, CPU (the GIL), or memory. Conquer Concurrency: Go beyond a simple await. Master the asyncio event loop, understand its ""blocking"" traps, and learn to build systems that can actually handle thousands of concurrent requests. Shatter the GIL: Stop fighting the Global Interpreter Lock. Learn to identify CPU-bound problems and use multiprocessing to shatter the ""one-core"" barrier and use your hardware's full power. Build an Impenetrable Data Layer: Your database is the bottleneck. Learn to protect it with advanced caching (Redis), denormalization, and the bulletproof ""Outbox Pattern"" to decouple your writes. Decouple Everything: Your app shouldn't do things ""right now."" Learn to use message queues like RabbitMQ and Kafka to build resilient, asynchronous, and blazing-fast services. Kill Your pandas Script (Before It Kills Your Server): That in-memory script is a time bomb. We'll show you how to move to out-of-core, parallel tools like Dask and Polars to process 500GB of data as easily as 5MB. Achieve True Observability: Learn to deploy and monitor with confidence. We'll cover everything from Docker and Kubernetes to the metrics that actually matter (hint: it's not ""average latency""). This book is your guide to moving from a developer who fights fires to an architect who prevents them. Stop ""fixing"" your code and start building systems that scale.

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