diff --git a/src/library/entry.cr b/src/library/entry.cr
index 92f4def..b5e582f 100644
--- a/src/library/entry.cr
+++ b/src/library/entry.cr
@@ -81,9 +81,17 @@ class Entry
 
   def cover_url
     return "#{Config.current.base_url}img/icon.png" if @err_msg
+
+    unless @book.entry_cover_url_cache
+      TitleInfo.new @book.dir do |info|
+        @book.entry_cover_url_cache = info.entry_cover_url
+      end
+    end
+    entry_cover_url = @book.entry_cover_url_cache
+
     url = "#{Config.current.base_url}api/cover/#{@book.id}/#{@id}"
-    TitleInfo.new @book.dir do |info|
-      info_url = info.entry_cover_url[@title]?
+    if entry_cover_url
+      info_url = entry_cover_url[@title]?
       unless info_url.nil? || info_url.empty?
         url = File.join Config.current.base_url, info_url
       end
diff --git a/src/library/title.cr b/src/library/title.cr
index 61c9813..6f2cf8c 100644
--- a/src/library/title.cr
+++ b/src/library/title.cr
@@ -3,9 +3,12 @@ require "../archive"
 class Title
   getter dir : String, parent_id : String, title_ids : Array(String),
     entries : Array(Entry), title : String, id : String,
-    encoded_title : String, mtime : Time, signature : UInt64
+    encoded_title : String, mtime : Time, signature : UInt64,
+    entry_cover_url_cache : Hash(String, String)?
+  setter entry_cover_url_cache : Hash(String, String)?
 
   @entry_display_name_cache : Hash(String, String)?
+  @entry_cover_url_cache : Hash(String, String)?
 
   def initialize(@dir : String, @parent_id)
     storage = Storage.default