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legend4tech
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@legend4tech legend4tech commented Apr 27, 2025

PR Description: Landing Page Performance Optimization

Title

Optimize Landing Page for Performance and Accessibility

Summary

This PR implements performance optimizations for the landing page to improve loading speed, user experience, and Performance. The changes focus on code splitting, lazy loading, semantic HTML, and image optimization to meet the performance requirements specified in the issue.

Changes Made

Landing Page Component (CallToActionPage.jsx)

  • Code Splitting & Lazy Loading:

  • Implemented React's lazy() and Suspense to defer loading of below-the-fold content

  • Added lazy loading for the WhyChooseAurora component with a loading fallback

  • Created a simple loading placeholder to improve perceived performance

  • Semantic HTML:

  • Replaced generic <div> elements with semantic <section> tags

  • Updated text elements to proper heading hierarchy (<h1>, <h2>) for better accessibility and SEO

  • Added appropriate ARIA attributes where needed

  • Resource Hints:

  • Added rel="preload" to critical navigation links

  • Structure Improvements:

  • Organized code with clear section comments

  • Improved component structure for better maintainability

Card Components (Cards.jsx)

  • Component Optimization:

  • Memoized all card components with React.memo() to prevent unnecessary re-renders

  • Accessibility Enhancements:

  • Added semantic <article> tags for card components

  • Implemented proper heading hierarchy with <h3> tags

  • Added aria-hidden="true" to decorative icons

  • Performance Improvements:

  • Added loading="lazy" attribute to defer button initialization

  • Optimized component structure for better rendering performance

Performance Impact

These optimizations are expected to significantly improve the following metrics:

  • First Contentful Paint (FCP): Reduced by prioritizing critical content
  • Largest Contentful Paint (LCP): Improved through better resource loading
  • Time to Interactive (TTI): Enhanced by deferring non-critical JavaScript
  • Cumulative Layout Shift (CLS): Reduced by proper image handling and layout structure

Testing Notes

  • Tested on multiple screen sizes to ensure responsive behavior
  • Verified lazy loading functionality works correctly
  • Confirmed semantic HTML structure with accessibility tools

Closes #127

Summary by CodeRabbit

  • New Features

    • Improved accessibility and semantic structure on the landing page by using appropriate HTML tags and headings.
    • Added a loading placeholder for the "Why Choose Aurora" section to enhance user experience during component loading.
    • Set the default font family to "Inter" for a consistent look across the site.
  • Style

    • Updated formatting and indentation for improved code readability.
    • Enhanced semantic markup for better accessibility.
    • Updated document type declaration to uppercase for standards compliance.
  • Refactor

    • Optimized landing page cards with memoized components to improve performance.
    • Lazy-loaded components for more efficient resource usage.
  • Chores

    • Removed unused imports and cleaned up minor formatting issues.

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coderabbitai bot commented Apr 27, 2025

Walkthrough

This set of changes focuses on improving the semantic structure, accessibility, and performance of the landing page components. Key updates include converting certain components to use React's memo for rendering optimization, introducing lazy loading for the WhyChooseAurora component with a loading fallback, and enhancing semantic HTML by replacing generic <div> and <p> tags with appropriate <section>, <article>, and heading tags. Minor formatting and import adjustments are made across several files, and the global font family is set in the CSS. No changes to core business logic or routing are introduced.

Changes

File(s) Change Summary
index.html Changed <!doctype html> to uppercase <!DOCTYPE html>; removed leading spaces before </html>.
src/index.css Added font-family: "Inter", sans-serif; to body. Reformatted .auth-button gradient. Removed extra blank lines.
src/App.jsx Reformatted <Route> elements for readability; no logic changes.
src/pages/aurora-site/home/index.jsx Removed unused imports (lucide-react, react-router-dom, AuroraIcon); retained only CallToActionPage import; no logic changes.
src/components/landing-page/call-to-action/CallToAction.jsx Implemented lazy loading for WhyChooseAurora with Suspense and fallback. Switched to semantic HTML (<section>, <h2>). Added rel="preload" to anchor. Reformatted mapped components to multiline JSX.
src/components/landing-page/call-to-action/Cards.jsx Converted components to React memo for optimization. Changed root containers to <article>. Added aria-hidden="true" to icon containers. Replaced <strong>/<p> with <h3> for titles. Fixed typo in WhyChooseAuruora. Minor formatting changes.
src/components/landing-page/call-to-action/Content.jsx Changed content properties from single-line strings to multi-line template literals. No logic or data changes.
src/components/landing-page/why-choose-aurora/index.jsx Switched import/export quotes from single to double. Removed trailing whitespace and added newline at end. No logic changes.

Sequence Diagram(s)

sequenceDiagram
  participant User
  participant CallToActionPage
  participant WhyChooseAurora (lazy)
  participant LoadingFallback

  User->>CallToActionPage: Visits landing page
  CallToActionPage->>WhyChooseAurora (lazy): Triggers lazy load
  WhyChooseAurora (lazy)-->>LoadingFallback: While loading, show fallback
  WhyChooseAurora (lazy)-->>CallToActionPage: Once loaded, render component
  CallToActionPage-->>User: Displays landing page with WhyChooseAurora
Loading

Assessment against linked issues

Objective Addressed Explanation
Implement lazy loading for below-the-fold content (#127)
Set up code splitting for JavaScript (#127)
Add resource hints such as preload (#127) rel="preload" added to anchor tag in CallToAction component.
Optimize fonts with font-display swap (#127) Font family set to "Inter", but no explicit font-display: swap shown in CSS changes.
Achieve good Lighthouse scores with performance optimizations (#127) Changes improve lazy loading and memoization, but no explicit evidence of full Lighthouse targets met.

Possibly related PRs

  • Call to action #187: Refactors and formats CallToAction component with lazy loading and semantic HTML, related to this PR's performance and structure improvements.

Suggested reviewers

  • Gerson2102

Poem

A hop, a skip, a semantic leap,
With lazy loads to help us keep
The landing swift, the markup neat—
Memoized bunnies, code complete!
Now headings shine and icons hide,
As Inter fonts bring style and pride.
🐇✨


📜 Recent review details

Configuration used: CodeRabbit UI
Review profile: CHILL
Plan: Pro

📥 Commits

Reviewing files that changed from the base of the PR and between 4a974e7 and 22a38e5.

📒 Files selected for processing (4)
  • src/components/landing-page/call-to-action/CallToAction.jsx (3 hunks)
  • src/components/landing-page/call-to-action/Cards.jsx (2 hunks)
  • src/components/landing-page/call-to-action/Content.jsx (1 hunks)
  • src/index.css (2 hunks)
✅ Files skipped from review due to trivial changes (2)
  • src/index.css
  • src/components/landing-page/call-to-action/Content.jsx
🧰 Additional context used
🧬 Code Graph Analysis (1)
src/components/landing-page/call-to-action/CallToAction.jsx (3)
src/components/landing-page/why-choose-aurora/index.jsx (1)
  • WhyChooseAurora (5-22)
src/components/landing-page/call-to-action/Content.jsx (2)
  • whatOurUsersSay (152-171)
  • whatOurUsersSay (152-171)
src/components/landing-page/call-to-action/Cards.jsx (2)
  • WhatOurUsersSay (84-108)
  • WhatOurUsersSay (84-108)
🪛 ESLint
src/components/landing-page/call-to-action/CallToAction.jsx

[error] 4-4: 'React' is defined but never used.

(no-unused-vars)

src/components/landing-page/call-to-action/Cards.jsx

[error] 1-1: 'React' is defined but never used.

(no-unused-vars)

🔇 Additional comments (10)
src/components/landing-page/call-to-action/CallToAction.jsx (6)

7-15: Great performance optimization with lazy loading!

The implementation of React's lazy() and Suspense for the WhyChooseAurora component is an excellent performance enhancement. The loading fallback provides a good user experience while the below-the-fold content loads.


96-99: Effective implementation of code splitting

The lazy loading implementation with Suspense is well-executed. This approach will help reduce initial page load time by deferring the loading of below-the-fold content until it's needed.


102-105: Improved semantic HTML structure

Replacing generic <div> with <section> and upgrading the text to proper <h2> heading improves accessibility, SEO, and document structure. This change aligns with web standards and makes the page more accessible to screen readers.


123-126: Improved semantic HTML structure

Replacing generic <div> with <section> and upgrading the text to proper <h2> heading improves accessibility, SEO, and document structure. This change aligns with web standards and makes the page more accessible to screen readers.


112-118: Enhanced readability with multi-line JSX

Breaking the component rendering into multiple lines with proper indentation improves code readability and maintainability.


4-4: ⚠️ Potential issue

Fix the ESLint error with React import

The static analysis shows that 'React' is defined but never used directly in JSX expressions. However, it's needed for the lazy-loaded component functionality.

Apply one of these fixes:

-import React, { lazy, Suspense } from "react";
+import { lazy, Suspense } from "react";
+const React = { lazy, Suspense }; // Keep React in scope for JSX

Or:

-import React, { lazy, Suspense } from "react";
+// eslint-disable-next-line no-unused-vars
+import React, { lazy, Suspense } from "react";

Likely an incorrect or invalid review comment.

🧰 Tools
🪛 ESLint

[error] 4-4: 'React' is defined but never used.

(no-unused-vars)

src/components/landing-page/call-to-action/Cards.jsx (4)

4-19: Great performance and accessibility improvements

Memoizing the component with React.memo() will prevent unnecessary re-renders, and the semantic changes improve accessibility:

  • Using <article> instead of <div> provides better semantic meaning
  • Adding aria-hidden="true" to decorative icons helps screen readers ignore non-essential content
  • Using <h3> for the tag name creates proper heading hierarchy

These changes align well with the performance and accessibility goals mentioned in the PR objectives.


21-45: Excellent semantic improvements to CoursesCard

The memoization and semantic upgrades enhance performance and accessibility:

  • Using React.memo() for optimization
  • Using semantic <article> tag
  • Adding aria-hidden="true" to decorative elements
  • Using proper heading hierarchy with <h3>

The removal of the invalid loading="lazy" attribute from the button (as flagged in previous reviews) is also good.


71-82: Good memoization of the CTACard component

Wrapping the CTACard component with React.memo() is a good optimization that will help prevent unnecessary re-renders.


84-108: Great accessibility and performance improvements for testimonials

The changes to the WhatOurUsersSay component are excellent:

  • Memoization for performance optimization
  • Semantic <article> tag instead of generic <div>
  • Proper heading hierarchy with <h3> for the name
  • Decorative quote icon with aria-hidden="true" for accessibility

These improvements align perfectly with the PR objectives of enhancing performance and accessibility.

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@legend4tech legend4tech marked this pull request as draft April 27, 2025 22:50
@legend4tech legend4tech marked this pull request as ready for review April 27, 2025 22:50
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Actionable comments posted: 2

🧹 Nitpick comments (2)
src/pages/aurora-site/home/index.jsx (1)

1-1: Remove unused React import. With the new JSX transform, the React import is no longer required and can be removed to clean up unused code.

🧰 Tools
🪛 ESLint

[error] 1-1: 'React' is defined but never used.

(no-unused-vars)

src/components/landing-page/why-choose-aurora/index.jsx (1)

1-1: Remove unused React import. ESLint flags React as defined but never used. It can be safely dropped under the automatic JSX runtime.

🧰 Tools
🪛 ESLint

[error] 1-1: 'React' is defined but never used.

(no-unused-vars)

📜 Review details

Configuration used: CodeRabbit UI
Review profile: CHILL
Plan: Pro

📥 Commits

Reviewing files that changed from the base of the PR and between 848b18f and 8479b3c.

⛔ Files ignored due to path filters (1)
  • src/assets/Aurora_word.jpg is excluded by !**/*.jpg
📒 Files selected for processing (8)
  • index.html (1 hunks)
  • src/App.jsx (1 hunks)
  • src/components/landing-page/call-to-action/CallToAction.jsx (2 hunks)
  • src/components/landing-page/call-to-action/Cards.jsx (1 hunks)
  • src/components/landing-page/call-to-action/Content.jsx (1 hunks)
  • src/components/landing-page/why-choose-aurora/index.jsx (2 hunks)
  • src/index.css (2 hunks)
  • src/pages/aurora-site/home/index.jsx (1 hunks)
🧰 Additional context used
🧬 Code Graph Analysis (1)
src/components/landing-page/why-choose-aurora/index.jsx (1)
src/components/landing-page/call-to-action/CallToAction.jsx (1)
  • WhyChooseAurora (7-7)
🪛 ESLint
src/components/landing-page/why-choose-aurora/index.jsx

[error] 1-1: 'React' is defined but never used.

(no-unused-vars)

src/components/landing-page/call-to-action/CallToAction.jsx

[error] 1-1: 'React' is defined but never used.

(no-unused-vars)

src/components/landing-page/call-to-action/Cards.jsx

[error] 1-1: 'React' is defined but never used.

(no-unused-vars)

🔇 Additional comments (19)
index.html (1)

1-1: Correct DOCTYPE declaration for HTML5 compliance. Using uppercase <!DOCTYPE html> improves compatibility and follows HTML5 standards.

src/index.css (1)

35-35: Set consistent body font to Inter. Adding font-family: "Inter", sans-serif; ensures consistent typography across the app and aligns with the updated design tokens.

src/pages/aurora-site/home/index.jsx (1)

2-3: Approve import simplification. Keeping only the CallToActionPage import removes cruft and improves maintainability of the HomePage component.

src/components/landing-page/call-to-action/Content.jsx (1)

57-96: Skip formatting-only updates. The refactor breaks string literals onto new lines for readability without any change in content or logic. No further action needed.

src/components/landing-page/why-choose-aurora/index.jsx (1)

2-3: Skip trivial formatting changes. Quote style updates and trailing whitespace removal do not affect behavior.

Also applies to: 24-24

src/App.jsx (3)

89-96: Good improvement in code formatting for readability.

The multi-line formatting for Route elements improves readability and maintainability, making the routing structure easier to follow.


101-104: Consistent formatting applied to practice routes.

The formatting changes provide better visual organization of the routing structure, which aligns with the PR's objectives for improving code organization and maintainability.

Also applies to: 107-118


121-138: Multi-line formatting for game and quiz routes is well applied.

These formatting changes enhance code readability while maintaining the same functionality, which is a good practice for large routing configurations.

src/components/landing-page/call-to-action/CallToAction.jsx (7)

19-24: Excellent semantic HTML improvements!

Converting the generic <div> to a semantic <section> tag and using a proper <h1> heading instead of a <p> tag significantly improves accessibility and SEO. This is a best practice that aligns perfectly with the PR objectives.


31-44: Good accessibility enhancement with preload attribute.

Adding the rel="preload" attribute to the "Get Started" link helps improve performance by prioritizing this critical resource.


47-61: Semantic structure improvement for Skills Section.

Converting to semantic <section> and proper <h2> heading hierarchy improves accessibility and makes the document structure more meaningful for screen readers.


63-84: Proper heading hierarchy in Courses Section.

Using semantic <section> and <h2> tags creates a proper document outline and improves screen reader navigation.


86-89: Effective implementation of lazy loading.

The Suspense wrapper with fallback for the WhyChooseAurora component is a great performance optimization for below-the-fold content. This will improve initial page load metrics like First Contentful Paint and Largest Contentful Paint.


92-110: Well-structured Testimonials Section with proper semantics.

The conversion to semantic HTML and proper heading hierarchy improves accessibility. The multiline JSX formatting for the mapped WhatOurUsersSay components also enhances code readability.


113-135: Semantic HTML improvements in Final CTA Section.

Converting to <section> with proper <h2> heading improves document structure and accessibility.

src/components/landing-page/call-to-action/Cards.jsx (4)

49-71: Typo fix and performance enhancement for WhyChooseAuruora.

Fixed the component name typo and added memoization for performance. The semantic HTML improvements using <article> and <h3> tags along with proper ARIA attributes enhance accessibility.


73-84: Memoized CTACard component.

Adding memoization to this component helps prevent unnecessary re-renders, optimizing performance.


86-110: Well-structured testimonial card with accessibility improvements.

The memoization, semantic <article> tag, proper heading hierarchy with <h3>, and aria-hidden="true" attribute for decorative icons all contribute to a more accessible and performant component.


1-19: ⚠️ Potential issue

Great performance optimization with memoization!

Converting the SkillCards component to use React.memo() prevents unnecessary re-renders, which is a valuable performance optimization. The use of semantic <article> tags and proper <h3> headings for card titles also improves accessibility.

One issue:

React is imported but flagged as unused by ESLint. For memoized components, you need to keep the React import:

-import React, { memo } from "react";
+import React from "react";
+import { memo } from "react";

Likely an incorrect or invalid review comment.

🧰 Tools
🪛 ESLint

[error] 1-1: 'React' is defined but never used.

(no-unused-vars)

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Actionable comments posted: 2

📜 Review details

Configuration used: CodeRabbit UI
Review profile: CHILL
Plan: Pro

📥 Commits

Reviewing files that changed from the base of the PR and between 8479b3c and 45c885b.

📒 Files selected for processing (1)
  • src/components/landing-page/call-to-action/Cards.jsx (1 hunks)
🧰 Additional context used
🪛 ESLint
src/components/landing-page/call-to-action/Cards.jsx

[error] 1-1: 'React' is defined but never used.

(no-unused-vars)

🔇 Additional comments (4)
src/components/landing-page/call-to-action/Cards.jsx (4)

5-19: Great accessibility and performance improvements in SkillCards!

The changes to this component follow best practices:

  • Memoization to prevent unnecessary re-renders
  • Semantic <article> tag instead of generic <div>
  • Proper heading hierarchy with <h3>
  • aria-hidden="true" for decorative icons

These improvements enhance both accessibility and performance.


21-46: Excellent updates to CoursesCard

The accessibility improvements are well-implemented:

  • Using React.memo for performance optimization
  • Converting to semantic <article> tag
  • Proper heading hierarchy with <h3>
  • Making decorative icons hidden from screen readers

I see you've also removed the invalid loading="lazy" attribute from the button element that was flagged in previous reviews. Good job!


72-83: Good optimization for CTACard

You've successfully implemented React.memo for performance optimization and improved the conditional rendering with the nullish coalescing operator.

Note that this component still uses a <div> rather than an <article> tag as its container, unlike the other card components. Is this intentional? If it serves as a container for other content rather than being standalone content itself, then a <div> may be appropriate.


85-109: Great accessibility improvements in WhatOurUsersSay

This component has been nicely improved with:

  • Memoization for better performance
  • Semantic <article> tag
  • Proper heading hierarchy with <h3>
  • Decorative quote icon correctly marked with aria-hidden="true"

These changes align perfectly with the PR objectives for performance and accessibility enhancements.

@legend4tech
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can be merged now conflicts resolved

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Hello @legend4tech ,
Thank you! Please resolve the conflicts

@legend4tech
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@zleypner conflict resolved can now be merged

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Thank you it works fine! Thank you for your contribution!
Nice work @legend4tech

@zleypner zleypner merged commit 0afe200 into AURORALAOrg:main May 1, 2025
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Issue 10: Implement Page Loading Optimizations
2 participants