diff --git a/src/main/java/org/threeten/extra/LocalDateRange.java b/src/main/java/org/threeten/extra/LocalDateRange.java
index acef7fbb..fc7ff77c 100644
--- a/src/main/java/org/threeten/extra/LocalDateRange.java
+++ b/src/main/java/org/threeten/extra/LocalDateRange.java
@@ -627,7 +627,7 @@ public Comparator<? super LocalDate> getComparator() {
                 return null;
             }
         };
-        return StreamSupport.stream(spliterator, false);
+        return StreamSupport.stream(spliterator, false).parallel();
     }
 
     //-----------------------------------------------------------------------
diff --git a/src/main/java/org/threeten/extra/scale/SystemUtcRules.java b/src/main/java/org/threeten/extra/scale/SystemUtcRules.java
index f1ac8dbe..eca33ab6 100644
--- a/src/main/java/org/threeten/extra/scale/SystemUtcRules.java
+++ b/src/main/java/org/threeten/extra/scale/SystemUtcRules.java
@@ -263,7 +263,7 @@ private static Data loadLeapSeconds() {
     private static Data loadLeapSeconds(URL url) throws ClassNotFoundException, IOException {
         List<String> lines;
         try (BufferedReader reader = new BufferedReader(new InputStreamReader(url.openStream(), StandardCharsets.UTF_8))) {
-            lines = reader.lines().collect(Collectors.toList());
+            lines = reader.lines().parallel().collect(Collectors.toList());
         }
         List<Long> dates = new ArrayList<>();
         List<Integer> offsets = new ArrayList<>();