diff --git a/lib/roo/excelx.rb b/lib/roo/excelx.rb
index 8b02e602..0ad27520 100644
--- a/lib/roo/excelx.rb
+++ b/lib/roo/excelx.rb
@@ -426,20 +426,6 @@ def process_zipfile_entries(entries)
       end
     end
 
-    # NOTE: To reduce memory, styles, shared_strings, workbook can be class
-    #       variables in a Shared module.
-    def styles
-      @styles ||= Styles.new(File.join(@tmpdir, 'roo_styles.xml'))
-    end
-
-    def shared_strings
-      @shared_strings ||= SharedStrings.new(File.join(@tmpdir, 'roo_sharedStrings.xml'))
-    end
-
-    def workbook
-      @workbook ||= Workbook.new(File.join(@tmpdir, 'roo_workbook.xml'))
-    end
-
     def safe_send(object, method, *args)
       object.send(method, *args) if object && object.respond_to?(method)
     end
diff --git a/lib/roo/excelx/cell.rb b/lib/roo/excelx/cell.rb
index 8ab21cb6..2fc78e16 100644
--- a/lib/roo/excelx/cell.rb
+++ b/lib/roo/excelx/cell.rb
@@ -11,7 +11,7 @@
 module Roo
   class Excelx
     class Cell
-      attr_reader :type, :formula, :value, :excelx_type, :excelx_value, :style, :hyperlink, :coordinate
+      attr_reader :formula, :value, :excelx_type, :excelx_value, :style, :hyperlink, :coordinate
       attr_writer :value
 
       # DEPRECATED: Please use Cell.create_cell instead.
diff --git a/lib/roo/open_office.rb b/lib/roo/open_office.rb
index 8fe8252c..2a8eba49 100644
--- a/lib/roo/open_office.rb
+++ b/lib/roo/open_office.rb
@@ -285,7 +285,6 @@ def perform_decryption(
           algorithm_node['manifest:initialisation-vector']
         )
         key_derivation_name = key_derivation_node['manifest:key-derivation-name']
-        key_size            = key_derivation_node['manifest:key-size'].to_i
         iteration_count     = key_derivation_node['manifest:iteration-count'].to_i
         salt                = Base64.decode64(key_derivation_node['manifest:salt'])
 
@@ -294,10 +293,8 @@ def perform_decryption(
           start_key_generation_node[
             'manifest:start-key-generation-name'
           ]
-        key_generation_size = start_key_generation_node['manifest:key-size'].to_i
 
         hashed_password = password
-        key             = nil
 
         if key_generation_name == 'http://www.w3.org/2000/09/xmldsig#sha256'