performance - enumerator.dev

performance

Three Memory Leak Patterns

Normal Memory Usage In a typical application, memory consumption should increase when the application boots and then stabilize. This pattern will repeat every time the application is deployed. Memory ^ | | ███████████████████████ ████████████████████ | █████████████████████████████ ██████████████████████████ | █████████████████████████████████████████████████████████ > Time Boot Stable Runtime Deploy Stable Runtime Gradual Leak In an appli

rails

Use Precomputed Hashes Instead of BCrypt in Test

I asked Claude to find the slowest test file again after my success earlier today and Claude found a call to BCrypt in my fixtures that was gobbling up time. I need user records all over the place in my test and each new user is a new call to

willow-camp

Speeding Up willow.camp's post_test.rb by 99%

Published on July 20, 2025 I just asked Claude to speed up the slowest test file in willow.camp. post_test.rb was taking over 1 second to execute. For a tiny Ruby app, that’s a long time. Here’s what Claude did. I was not expecting such a

rails

How Rack::Timeout Keeps Your App Alive

Rack::Timeout is a library that monitors long-running requests in a Ruby app and kills them if they take too long. The default configuration in Rack::Timeout is to kill requests that take 15 seconds or longer. Why Do Requests Take A Long Time? The answer here will vary from

performance

Middleware

Middleware is a piece of code that mediates the request and response to the application server.

postgresql

Ouch! Killing PG Performance with Row-Level Security

Postgres 11 and higher has a feature called Row Security Policies, or Row-Level Security, which is a great feature for restricting access to rows in a tabel on a per-user basis. However, if you’re not careful, you can drag down performance with a bad policy. The post below comes

postgresql

One WEIRD Trick for Speeding Up ORDER BY That You Probably Shouldn't Use

I was digging into a performance issue at work recently and found THE WEIRDEST way of speeding up a query that uses ORDER BY. When testing against our replica database, I was getting results up to 100 times faster than before.

rails

Two Tools for Diagnosing Slow Endpoints in Rails

In general, I see two types of slow endpoints when I am doing performance work: endpoints that have bad code causing a slow response, and endpoints that have a bad query causing a slow response. This post will focus on endpoints that have bad code. Slow endpoints can be identified