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⚡ Bolt: Resource loading and script execution optimization#9

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bolt-perf-optimization-7463695911786762936
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⚡ Bolt: Resource loading and script execution optimization#9
rtech-technologies wants to merge 1 commit into
mainfrom
bolt-perf-optimization-7463695911786762936

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@rtech-technologies

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Implemented several performance optimizations to improve page load speed and time-to-interactivity.

Key changes:

  1. Resource Hints: Added <link rel="preconnect"> for fonts.googleapis.com, fonts.gstatic.com, and cdn.tailwindcss.com. This reduces connection setup time (DNS, TCP, TLS) for critical external assets.
  2. Variable Fonts: Switched from discrete weights to a variable font range for JetBrains Mono. This allows the browser to fetch a single, more efficient font file that covers all used weights and styles (including font-black/800 and italics).
  3. Script Execution Timing: In os2.html, moved the checkAvailability() call from window.onload to a direct call at the end of the body. This allows the ISO availability check to start as soon as the DOM is ready, rather than waiting for all external assets to finish loading, significantly improving the time-to-interactivity for the download button.
  4. HTML Correctness: Fixed a structural issue where index.html contained markdown-style headers and code fences. It now strictly begins with <!DOCTYPE html>.

Measurement:

  • Connection setup time reduced by using preconnect.
  • TTI for the download button in os2.html improved by bypassing window.onload.
  • Verified using Playwright to ensure zero regressions in functionality or rendering.

PR created automatically by Jules for task 7463695911786762936 started by @rtech-technologies

- Added preconnect resource hints for Google Fonts and Tailwind CDN.
- Updated Google Fonts to use an efficient variable font range (400..800) with italics support.
- Optimized script execution in os2.html by moving the availability check to immediate execution.
- Cleaned up index.html to ensure a valid HTML structure starting with <!DOCTYPE html>.
- Documented optimizations with inline comments as per project standards.

Co-authored-by: rtech-technologies <254326487+rtech-technologies@users.noreply.github.com>
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