JavaScript Performance Audit
Find slow JavaScript with the Performance panel and fix long tasks.
What you'll learn
- Record and read a performance profile
- Break up long tasks
- Reduce bundle size
- Load third-party scripts carefully
About this course
You profile a sluggish page and fix the scripts that slow it down. You cover long tasks, third-party scripts, bundle size and main-thread work.
Course curriculum
4 modules and 12 lessons over 3 weeks. Plan for about 9 learning hours.
01ProfilingWeek 1 · 3 lessons
- Performance panel
- Flame charts
- Long tasks
02Main threadWeek 1 · 3 lessons
- Yielding
- Debouncing
- Web workers
03BundlesWeek 2 · 3 lessons
- Bundle analysis
- Code splitting
- Tree shaking
04Third partiesWeek 3 · 3 lessons
- Script loading
- Facades
- Audit report
Project
JavaScript audit. A profiled sample page with long tasks fixed and bundle size reduced.
Who this course is for
Front-end developers whose pages feel slow to respond.
Prerequisites
You write JavaScript for the browser.
What's included
- 120-day course access
- Step-by-step lessons
- Practice files
- Reusable code templates
- A graded final exercise
- A digital completion certificate
Learning format
Self-paced practical course, part of our self-paced courses. Graded final exercise with written feedback.
Access and delivery
- Enrollment is activated within 15 minutes after payment.
- Final exercise feedback is delivered within 2 business days of submission, and the completion certificate is issued within 2 business days after passing the final exercise.
Certificate
You receive a digital completion certificate. Final exercise feedback is delivered within 2 business days of submission, and the completion certificate is issued within 2 business days after passing the final exercise.
Frequently asked questions
When does access start?
Enrollment is activated within 15 minutes after payment.
Is payment taken on this website?
No. After you submit your enrollment request, we reply by email with payment details and enrollment confirmation.
Does this course guarantee a job or income?
No. It is an education and training service and does not include employment, income or placement guarantees.
Can I cancel?
Our Refund and Cancellation Policy lists the terms for self-paced course programs.
