To find slow plugins: Deactivate all plugins, then reactivate them one at a time, testing page load speed after each. The plugin that causes the biggest slowdown is your culprit. Common offenders include social sharing plugins, page builders with heavy JavaScript, analytics plugins that run queries on every page load, and plugins that make external API calls.
For a complete WordPress speed optimization guide:
This article has been consolidated into our WordPress Performance guide for easier reference.
