Performance improvements after caching html fragments

• re-use event cache with other users
• cache commit fragment
• cache issue fragment in list
• cache comment parsed with markdown

app/views/events/_event.html.haml

@@ -3,14 +3,15 @@
.event-item-timestamp
#{time_ago_with_tooltip(event.created_at)}
-    = cache [event, current_user] do
-      = image_tag avatar_icon(event.author_email, 24), class: "avatar s24", alt:''
-
-      - if event.push?
-        = render "events/event/push", event: event
-      - elsif event.commented?
-        = render "events/event/note", event: event
-      - elsif event.created_project?
+    - if event.created_project?
+      = cache [event, current_user] do
= render "events/event/created_project", event: event
-      - else
-        = render "events/event/common", event: event
\ No newline at end of file
+    - else
+      = cache event do
+        = image_tag avatar_icon(event.author_email, 24), class: "avatar s24", alt:''
+        - if event.push?
+          = render "events/event/push", event: event
+        - elsif event.commented?
+          = render "events/event/note", event: event
+        - else
+          = render "events/event/common", event: event