diff --git a/app/Main.hs b/app/Main.hs
index 7ccf158..265adf1 100644
--- a/app/Main.hs
+++ b/app/Main.hs
@@ -13,6 +13,9 @@
 
 module Main (main) where
 
+import Control.DeepSeq (force)
+import Control.Exception (evaluate)
+import Control.Monad (void)
 import Data.Char (chr)
 import Data.FileEmbed (embedFile)
 import Data.Foldable (for_)
@@ -55,7 +58,12 @@ import qualified UToy.Names as Names
 import qualified UToy.Parsers as Parsers
 
 main :: IO ()
-main = Warp.run 3000 app
+main = do
+  -- Forced evaluation of Names.lowerNames to reduce number of thunks.
+  putStrLn "* Building search index"
+  void $ evaluate $ force Names.lowerNames
+  putStrLn "* Listening on http://localhost:3000"
+  Warp.run 3000 app
 
 app :: Application
 app = serve (Proxy :: Proxy API) server
diff --git a/src/UToy/Names.hs b/src/UToy/Names.hs
index 33d9c13..03aa620 100644
--- a/src/UToy/Names.hs
+++ b/src/UToy/Names.hs
@@ -1,4 +1,4 @@
-module UToy.Names (allNames, blockName, searchCaseInsensitive) where
+module UToy.Names (allNames, blockName, lowerNames, searchCaseInsensitive) where
 
 import Data.Char (ord)
 import Data.Maybe (maybeToList)
@@ -25,7 +25,7 @@ searchCaseInsensitive search = filter go [minBound..maxBound]
     go c = any matches $ Vector.unsafeIndex lowerNames (ord c - ord minBound)
     matches t = Text.toLower search `Text.isInfixOf` t
 
-lowerNames :: Vector [Text]
+lowerNames :: Vector (Vector Text)
 lowerNames = Vector.fromList $ map go [minBound..maxBound]
   where
-    go = map Text.toLower . allNames
+    go = Vector.fromList . map Text.toLower . allNames
diff --git a/utoy.cabal b/utoy.cabal
index 82f9ea2..5215eb8 100644
--- a/utoy.cabal
+++ b/utoy.cabal
@@ -46,6 +46,7 @@ executable utoy
     , base >=4.7 && <5
     , blaze-html
     , bytestring
+    , deepseq
     , file-embed
     , http-media
     , servant-server