Add single-benchmark execute, simplify compilation

performance/benchmarks/fizzbuzz_10000.rb

@@ -1,10 +1,7 @@
 # frozen_string_literal: true
 
-Benchmarks.define('fizzbuzz_10000', Class.new do
-  TEMPLATE = <<~LIQUID
-  {% for i in (1..10000) %}{{ i }}
-  {% endfor %}
-  LIQUID
+Benchmarks.define('simple_loop', Class.new do
+  TEMPLATE = "{% for i in (1..1000) %}{{ i }}{% endfor %}"
 
   def compile
     @parsed = Liquid::Template.parse(TEMPLATE)

performance/benchmarks/simple_loop.rb

@@ -0,0 +1,13 @@
+# frozen_string_literal: true
+
+Benchmarks.define('simple_loop', Class.new do
+  TEMPLATE = "{% for i in (1..1000) %}{{ i }}{% endfor %}"
+
+  def compile
+    @parsed = Liquid::Template.parse(TEMPLATE)
+  end
+
+  def render
+    @parsed.render
+  end
+end.new)

performance/benchmarks/theme_runner.rb

@@ -2,4 +2,4 @@
 
 require_relative '../theme_runner'
 
-Benchmarks.define('theme_runner', ThemeRunner.new) 
+#Benchmarks.define('theme_runner', ThemeRunner.new)