Cache block_delimiter strings per tag name — avoids repeated string interpolation\n\nResult: {"status":"keep","combined_µs":4372,"parse_µs":3127,"render_µs":1245,"allocations":25605}

lib/liquid/block.rb

@@ -60,8 +60,11 @@ module Liquid
       @tag_name
     end
 
+    # Cache block delimiters per tag name to avoid repeated string allocation
+    BLOCK_DELIMITER_CACHE = Hash.new { |h, k| h[k] = "end#{k}".freeze }
+
     def block_delimiter
-      @block_delimiter ||= "end#{block_name}"
+      @block_delimiter ||= BLOCK_DELIMITER_CACHE[block_name]
     end
 
     private