diff --git a/Dockerfile b/Dockerfile
index f015967..1946e20 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -87,11 +87,13 @@ ARG LEIN_ROOT=yes
 
 # install asciinema
 
+ENV RAILS_ENV "production"
+
 RUN mkdir -p /app/tmp /app/log
 WORKDIR /app
 
 ADD Gemfile* /app/
-RUN bundle install
+RUN bundle install --deployment --without development test
 
 ADD a2png/project.clj /app/a2png/
 RUN cd a2png && lein deps
@@ -99,7 +101,7 @@ RUN cd a2png && lein deps
 ADD . /app
 
 RUN cd src && make
-
+RUN bundle exec rake assets:precompile
 RUN cd a2png && lein cljsbuild once main && lein cljsbuild once page
 
 # configure Nginx
@@ -116,7 +118,6 @@ VOLUME ["/app/config", "/app/log", "/app/uploads"]
 # 172.17.42.1 is the docker0 address
 ENV DATABASE_URL "postgresql://postgres:mypass@172.17.42.1/asciinema"
 ENV REDIS_URL "redis://172.17.42.1:6379"
-ENV RAILS_ENV "development"
 # when using Docker Toolbox/Virtualbox this is going to be your address
 # set to whatever FQDN/address you want asciinema to advertise itself as
 # for ex. asciinema.example.com
diff --git a/docker/nginx/asciinema.conf b/docker/nginx/asciinema.conf
index 981aa6e..6e92331 100644
--- a/docker/nginx/asciinema.conf
+++ b/docker/nginx/asciinema.conf
@@ -16,6 +16,14 @@ server {
         try_files $uri $uri/index.html $uri.html @rails;
     }
 
+    location ~ ^/assets/ {
+        expires 1y;
+        add_header Cache-Control public;
+
+        add_header ETag "";
+        break;
+    }
+
     location @rails {
         proxy_set_header X-Real-IP $remote_addr;
         proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;