diff --git a/src/library/entry.cr b/src/library/entry.cr
index 4ff01ee..92f4def 100644
--- a/src/library/entry.cr
+++ b/src/library/entry.cr
@@ -46,6 +46,18 @@ class Entry
     file.close
   end
 
+  def to_slim_json : String
+    JSON.build do |json|
+      json.object do
+        {% for str in ["zip_path", "title", "size", "id"] %}
+        json.field {{str}}, @{{str.id}}
+      {% end %}
+        json.field "title_id", @book.id
+        json.field "pages" { json.number @pages }
+      end
+    end
+  end
+
   def to_json(json : JSON::Builder)
     json.object do
       {% for str in ["zip_path", "title", "size", "id"] %}
diff --git a/src/library/library.cr b/src/library/library.cr
index 8fad451..e359847 100644
--- a/src/library/library.cr
+++ b/src/library/library.cr
@@ -85,6 +85,21 @@ class Library
     titles + titles.flat_map &.deep_titles
   end
 
+  def to_slim_json : String
+    JSON.build do |json|
+      json.object do
+        json.field "dir", @dir
+        json.field "titles" do
+          json.array do
+            self.titles.each do |title|
+              json.raw title.to_slim_json
+            end
+          end
+        end
+      end
+    end
+  end
+
   def to_json(json : JSON::Builder)
     json.object do
       json.field "dir", @dir
diff --git a/src/library/title.cr b/src/library/title.cr
index a757d42..61c9813 100644
--- a/src/library/title.cr
+++ b/src/library/title.cr
@@ -57,6 +57,41 @@ class Title
     end
   end
 
+  def to_slim_json : String
+    JSON.build do |json|
+      json.object do
+        {% for str in ["dir", "title", "id"] %}
+        json.field {{str}}, @{{str.id}}
+      {% end %}
+        json.field "signature" { json.number @signature }
+        json.field "titles" do
+          json.array do
+            self.titles.each do |title|
+              json.raw title.to_slim_json
+            end
+          end
+        end
+        json.field "entries" do
+          json.array do
+            @entries.each do |entry|
+              json.raw entry.to_slim_json
+            end
+          end
+        end
+        json.field "parents" do
+          json.array do
+            self.parents.each do |title|
+              json.object do
+                json.field "title", title.title
+                json.field "id", title.id
+              end
+            end
+          end
+        end
+      end
+    end
+  end
+
   def to_json(json : JSON::Builder)
     json.object do
       {% for str in ["dir", "title", "id"] %}
diff --git a/src/routes/api.cr b/src/routes/api.cr
index 0102e0d..a66210a 100644
--- a/src/routes/api.cr
+++ b/src/routes/api.cr
@@ -126,8 +126,11 @@ struct APIRouter
       end
     end
 
-    Koa.describe "Returns the book with title `tid`"
+    Koa.describe "Returns the book with title `tid`", <<-MD
+    Supply the `tid` query parameter to strip away "display_name", "cover_url", and "mtime" from the returned object to speed up the loading time
+    MD
     Koa.path "tid", desc: "Title ID"
+    Koa.query "slim"
     Koa.response 200, schema: "title"
     Koa.response 404, "Title not found"
     Koa.tag "library"
@@ -137,7 +140,11 @@ struct APIRouter
         title = Library.default.get_title tid
         raise "Title ID `#{tid}` not found" if title.nil?
 
-        send_json env, title.to_json
+        if env.params.query["slim"]?
+          send_json env, title.to_slim_json
+        else
+          send_json env, title.to_json
+        end
       rescue e
         Logger.error e
         env.response.status_code = 404
@@ -145,14 +152,21 @@ struct APIRouter
       end
     end
 
-    Koa.describe "Returns the entire library with all titles and entries"
+    Koa.describe "Returns the entire library with all titles and entries", <<-MD
+    Supply the `tid` query parameter to strip away "display_name", "cover_url", and "mtime" from the returned object to speed up the loading time
+    MD
+    Koa.query "slim"
     Koa.response 200, schema: {
       "dir"    => String,
       "titles" => ["title"],
     }
     Koa.tag "library"
     get "/api/library" do |env|
-      send_json env, Library.default.to_json
+      if env.params.query["slim"]?
+        send_json env, Library.default.to_slim_json
+      else
+        send_json env, Library.default.to_json
+      end
     end
 
     Koa.describe "Triggers a library scan"