diff --git a/appveyor.yml b/appveyor.yml
line changes: +15/-8
index 643d62b..8f9f121
--- a/appveyor.yml
+++ b/appveyor.yml

@@ -49,14 +49,16 @@ environment:
   # Beta 32-bit MSVC
     - channel: beta
       target: i686-pc-windows-msvc
-  # Nightly 64-bit MSVC
-    - channel: nightly
-      target: x86_64-pc-windows-msvc
-      #cargoflags: --features "unstable"
-  # Nightly 32-bit MSVC
-    - channel: nightly
-      target: i686-pc-windows-msvc
-      #cargoflags: --features "unstable"
+
+# Appveyor is slow.  Disable nightly for now.
+#  # Nightly 64-bit MSVC
+#    - channel: nightly
+#      target: x86_64-pc-windows-msvc
+#      #cargoflags: --features "unstable"
+#  # Nightly 32-bit MSVC
+#    - channel: nightly
+#      target: i686-pc-windows-msvc
+#      #cargoflags: --features "unstable"
 
 ### GNU Toolchains ###
 

@@ -93,6 +95,11 @@ matrix:
 # If you only care about stable channel build failures, uncomment the following line:
     #- channel: beta
 
+# Only build direct changes to master branch.  PRs still built.
+branches:
+  only:
+    - "master"
+
 ## Install Script ##
 
 # This is the most important part of the Appveyor configuration. This installs the version of Rust