defer some more

_config.yml

@@ -48,6 +48,8 @@ javascript_bundles:
       - assets/js/theme.js
   main:
     preload: true
+    defer: true
+    async: true
     resources:
       - assets/js/jquery.slim.min.js   # Mandatory for bootstrap.
       - assets/js/popper.min.js        # Everywhere, dropdown menu.

_layouts/home.html

@@ -248,7 +248,7 @@ <h2>Meet & Join the Community!</h2>
             <h2>GTN Toots</h2>
 
 <link rel="stylesheet" type="text/css" href="{{ site.baseurl }}/assets/js/emfed/toots.css">
-		<script type="module" src="{{ site.baseurl }}/assets/js/emfed/emfed.js"></script>
+		<script async defer type="module" src="{{ site.baseurl }}/assets/js/emfed/emfed.js"></script>
 		<a rel="me" class="mastodon-feed"
 		href="https://mstdn.science/@gtn"
 		data-toot-limit="3"

_plugins/jekyll-bundler.rb

@@ -89,8 +89,12 @@ def load_bundle_dev(name)
 
       baseurl = @context.registers[:site].config['baseurl']
 
+      attrs = ""
+      attrs += " async" if bundle['async']
+      attrs += " defer" if bundle['defer']
+
       bundle['resources'].map do |f|
-        "<script src='#{baseurl}/#{f}'></script>"
+        "<script #{attrs} src='#{baseurl}/#{f}'></script>"
       end.join("\n")
     end
 
@@ -99,8 +103,11 @@ def load_bundle_production(name)
       raise "Bundle #{name} not found in site config" if bundle.nil?
 
       baseurl = @context.registers[:site].config['baseurl']
+      attrs = ""
+      attrs += " async" if bundle['async']
+      attrs += " defer" if bundle['defer']
       bundle_path = "#{baseurl}#{bundle['path']}?v=#{bundle['timestamp']}"
-      "<script src='#{bundle_path}'></script>"
+      "<script #{attrs} src='#{bundle_path}'></script>"
     end
   end
 end