diff --git a/app/models/theme.rb b/app/models/theme.rb
index c8b577763f0..ef34ef6a946 100644
--- a/app/models/theme.rb
+++ b/app/models/theme.rb
@@ -6,7 +6,7 @@ require 'json_schemer'
 class Theme < ActiveRecord::Base
   include GlobalPath
 
-  BASE_COMPILER_VERSION = 67
+  BASE_COMPILER_VERSION = 68
 
   attr_accessor :child_components
 
@@ -394,7 +394,12 @@ class Theme < ActiveRecord::Base
       end
       caches = JavascriptCache.where(theme_id: theme_ids)
       caches = caches.sort_by { |cache| theme_ids.index(cache.theme_id) }
-      return caches.map { |c| "<script defer src='#{c.url}' data-theme-id='#{c.theme_id}'></script>" }.join("\n")
+      return caches.map do |c|
+        <<~HTML.html_safe
+          <link rel="preload" href="#{c.url}" as="script">
+          <script defer src='#{c.url}' data-theme-id='#{c.theme_id}'></script>
+        HTML
+      end.join("\n")
     end
     list_baked_fields(theme_ids, target, name).map { |f| f.value_baked || f.value }.join("\n")
   end
diff --git a/app/models/theme_field.rb b/app/models/theme_field.rb
index 475e3541565..4c45b08b60d 100644
--- a/app/models/theme_field.rb
+++ b/app/models/theme_field.rb
@@ -148,7 +148,14 @@ class ThemeField < ActiveRecord::Base
     javascript_cache.source_map = js_compiler.source_map
     javascript_cache.save!
 
-    doc.add_child("<script defer src='#{javascript_cache.url}' data-theme-id='#{theme_id}'></script>") if javascript_cache.content.present?
+    if javascript_cache.content.present?
+      doc.add_child(
+        <<~HTML.html_safe
+          <link rel="preload" href="#{javascript_cache.url}" as="script">
+          <script defer src='#{javascript_cache.url}' data-theme-id='#{theme_id}'></script>
+        HTML
+      )
+    end
     [doc.to_s, errors&.join("\n")]
   end
 
@@ -241,7 +248,13 @@ class ThemeField < ActiveRecord::Base
     javascript_cache.source_map = js_compiler.source_map
     javascript_cache.save!
     doc = ""
-    doc = "<script defer src='#{javascript_cache.url}' data-theme-id='#{theme_id}'></script>" if javascript_cache.content.present?
+    if javascript_cache.content.present?
+      doc =
+        <<~HTML.html_safe
+          <link rel="preload" href="#{javascript_cache.url}" as="script">
+          <script defer src='#{javascript_cache.url}' data-theme-id='#{theme_id}'></script>
+        HTML
+    end
     [doc, errors&.join("\n")]
   end