From 0004471dde29a00d1c0720657af90b236963eae9 Mon Sep 17 00:00:00 2001 From: Parker Lougheed Date: Tue, 24 Oct 2023 11:33:18 -0500 Subject: [PATCH] Reduce home page load time by lazy loading DartPad iframe (#5272) [Lazy loads](https://web.dev/articles/iframe-lazy-loading) the DartPad iframe on the (bottom of the homepage) since it is almost always offscreen on first load and does not need to delay other parts of site loading. The browsers that respect this can choose to load it based on certain heuristics, so it may not make a difference, but across a few runs I saw the largest contentful paint time in lighthouse reduce by 1-5%. --- .../dash/js/dartpad_picker_main.dart.js | 209 +++++++++--------- src/index.html | 2 +- tool/dartpad_picker/lib/dartpad_picker.dart | 4 +- tool/dartpad_picker/pubspec.yaml | 2 +- 4 files changed, 114 insertions(+), 103 deletions(-) diff --git a/src/assets/dash/js/dartpad_picker_main.dart.js b/src/assets/dash/js/dartpad_picker_main.dart.js index 085483fda..adc8695d4 100644 --- a/src/assets/dash/js/dartpad_picker_main.dart.js +++ b/src/assets/dash/js/dartpad_picker_main.dart.js @@ -61,7 +61,102 @@ return r}function updateHolder(a,b){copyProperties(b,a) return a}var hunkHelpers=function(){var s=function(a,b,c,d,e){return function(f,g,h,i){return installInstanceTearOff(f,g,a,b,c,d,[h],i,e,false)}},r=function(a,b,c,d){return function(e,f,g,h){return 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Want more practice? Learn the language,
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diff --git a/tool/dartpad_picker/lib/dartpad_picker.dart b/tool/dartpad_picker/lib/dartpad_picker.dart index e7c405fdf..77615f051 100644 --- a/tool/dartpad_picker/lib/dartpad_picker.dart +++ b/tool/dartpad_picker/lib/dartpad_picker.dart @@ -54,7 +54,9 @@ class DartPadPicker { void _initDartPad() { _iFrameElement = IFrameElement() - ..src = iFrameSrc(theme: 'dark', mode: 'dart'); + ..src = iFrameSrc(theme: 'dark', mode: 'dart') + ..attributes['loading'] = 'lazy'; + final id = frameId; if (id != null) { _iFrameElement.id = id; diff --git a/tool/dartpad_picker/pubspec.yaml b/tool/dartpad_picker/pubspec.yaml index daa91163c..0b898c9ad 100644 --- a/tool/dartpad_picker/pubspec.yaml +++ b/tool/dartpad_picker/pubspec.yaml @@ -8,4 +8,4 @@ dev_dependencies: analysis_defaults: path: ../../site-shared/packages/analysis_defaults build_runner: ^2.4.6 - build_web_compilers: ^4.0.5 + build_web_compilers: ^4.0.6