codesnips

performance

ruby 
require "csv"

class PeopleCsvStream
  include Enumerable

  HEADERS = %w[id full_name email signed_up_at plan].freeze

Resilient CSV Export as a Streamed Response

rails performance streaming
by codesnips 3 tabs
ruby 
Rails.application.configure do
  config.after_initialize do
    Bullet.enable = true
    Bullet.alert = false
    Bullet.bullet_logger = true
    Bullet.console = true

N+1 query detection with Bullet gem

rails performance activerecord
by Alex Kumar 2 tabs
ruby 
json.array! @posts do |post|
  json.cache! ['v1', post], expires_in: 1.hour do
    json.id post.id
    json.title post.title
    json.excerpt post.excerpt
    json.published_at post.published_at

Fragment caching for expensive JSON serialization

rails caching performance
by Alex Kumar 1 tab
go 
package deps

import (
  "net"
  "net/http"
  "time"

HTTP client tuned for production: timeouts, transport, and connection reuse

go http client
by Leah Thompson 1 tab
ruby 
class Comment < ApplicationRecord
  belongs_to :post, touch: true
  belongs_to :author, class_name: "User"

  validates :body, presence: true, length: { maximum: 10_000 }

Granular Cache Invalidation with touch: true

rails caching activerecord
by codesnips 4 tabs
kotlin 
package com.example.myapp.utils

import android.os.Build
import android.os.StrictMode
import android.os.Trace
import timber.log.Timber

Performance optimization and profiling

kotlin android performance
by Alex Chen 2 tabs
go 
package pools

import (
  "bytes"
  "sync"
)

sync.Pool for bytes.Buffer to reduce allocations in hot paths

go performance memory
by Leah Thompson 1 tab
erb 
<nav class="site-nav" data-controller="preload">
  <ul>
    <li>
      <%= link_to "Dashboard", dashboard_path,
            class: "nav-link",
            data: { turbo_preload: true } %>

Speed up perceived performance with Turbo preload links

rails hotwire turbo
by codesnips 3 tabs
ruby 
class CreateTopSellersMv < ActiveRecord::Migration[7.0]
  def up
    execute <<~SQL
      CREATE MATERIALIZED VIEW top_sellers AS
        SELECT p.id            AS product_id,
               p.name          AS product_name,

Cache-Friendly “Top N” with Materialized View Refresh

rails postgres performance
by codesnips 4 tabs
javascript 
const withBundleAnalyzer = require('@next/bundle-analyzer')({
  enabled: process.env.ANALYZE === 'true',
  openAnalyzer: true,
});

/** @type {import('next').NextConfig} */

Next.js bundle analyzer for targeted performance work

nextjs performance tooling
by codesnips 4 tabs
typescript 
import type { IncomingMessage, ServerResponse } from "http";

const MIN_BYTES = 1024;

const INCOMPRESSIBLE = /^(image|video|audio)\/|application\/(zip|gzip|x-brotli|pdf|octet-stream)/i;

Response compression (only when it helps)

performance http express
by codesnips 3 tabs
ruby 
class PostsController < ApplicationController
  def index
    posts = Post.for_feed.page(params[:page]).per(25)

    render json: {
      data: posts.map { |post| PostSerializer.new(post).as_json },

N+1 Proof Serialization with preloaded associations

rails activerecord performance
by codesnips 3 tabs