Lazily load profiler hooks

lib/liquid/profiler.rb

@@ -70,6 +70,10 @@ module Liquid
       end
     end
 
+    def self.hooks_loaded
+      false
+    end
+
     def self.profile_token_render(token)
       if Profiler.current_profile && token.respond_to?(:render)
         Profiler.current_profile.start_token(token)

lib/liquid/profiler/hooks.rb

@@ -1,4 +1,10 @@
 module Liquid
+  class Profiler
+    def self.hooks_loaded
+      true
+    end
+  end
+
   class BlockBody
     def render_token_with_profiling(token, context)
       Profiler.profile_token_render(token) do

lib/liquid/template.rb

@@ -250,6 +250,8 @@ module Liquid
 
     def with_profiling
       if @profiling && !@options[:included]
+        Liquid.load_profiler_hooks unless Profiler.hooks_loaded
+
         @profiler = Profiler.new
         @profiler.start