diff --git a/resources/celerity/map.php b/resources/celerity/map.php
--- a/resources/celerity/map.php
+++ b/resources/celerity/map.php
@@ -9,8 +9,8 @@
   'names' => array(
     'conpherence.pkg.css' => 'e25569a9',
     'conpherence.pkg.js' => '6249a1cf',
-    'core.pkg.css' => '25cda14d',
-    'core.pkg.js' => 'f1e0e26f',
+    'core.pkg.css' => '7cd6d9cb',
+    'core.pkg.js' => '1fa7c0c5',
     'darkconsole.pkg.js' => 'e7393ebb',
     'differential.pkg.css' => '4815647b',
     'differential.pkg.js' => 'ddfeb49b',
@@ -29,7 +29,7 @@
     'rsrc/css/aphront/phabricator-nav-view.css' => 'b29426e9',
     'rsrc/css/aphront/table-view.css' => '213a5981',
     'rsrc/css/aphront/tokenizer.css' => '9a8cb501',
-    'rsrc/css/aphront/tooltip.css' => '3f325821',
+    'rsrc/css/aphront/tooltip.css' => '8f9faa9a',
     'rsrc/css/aphront/typeahead-browse.css' => '8904346a',
     'rsrc/css/aphront/typeahead.css' => 'd4f16145',
     'rsrc/css/application/almanac/almanac.css' => 'dbb9b3af',
@@ -486,7 +486,7 @@
     'rsrc/js/core/ShapedRequest.js' => '7cbe244b',
     'rsrc/js/core/TextAreaUtils.js' => '320810c8',
     'rsrc/js/core/Title.js' => '485aaa6c',
-    'rsrc/js/core/ToolTip.js' => 'd02f7181',
+    'rsrc/js/core/ToolTip.js' => '8fadb715',
     'rsrc/js/core/behavior-active-nav.js' => 'e379b58e',
     'rsrc/js/core/behavior-audio-source.js' => '59b251eb',
     'rsrc/js/core/behavior-autofocus.js' => '7319e029',
@@ -553,7 +553,7 @@
     'aphront-panel-view-css' => '8427b78d',
     'aphront-table-view-css' => '213a5981',
     'aphront-tokenizer-control-css' => '9a8cb501',
-    'aphront-tooltip-css' => '3f325821',
+    'aphront-tooltip-css' => '8f9faa9a',
     'aphront-typeahead-control-css' => 'd4f16145',
     'application-search-view-css' => '20ae9d85',
     'auth-css' => '0877ed6e',
@@ -811,7 +811,7 @@
     'phabricator-standard-page-view' => '894d8a25',
     'phabricator-textareautils' => '320810c8',
     'phabricator-title' => '485aaa6c',
-    'phabricator-tooltip' => 'd02f7181',
+    'phabricator-tooltip' => '8fadb715',
     'phabricator-ui-example-css' => '528b19de',
     'phabricator-uiexample-javelin-view' => 'd4a14807',
     'phabricator-uiexample-reactor-button' => 'd19198c8',
@@ -1602,6 +1602,12 @@
       'javelin-stratcom',
       'javelin-util',
     ),
+    '8fadb715' => array(
+      'javelin-install',
+      'javelin-util',
+      'javelin-dom',
+      'javelin-vector',
+    ),
     '8ff5e24c' => array(
       'javelin-behavior',
       'javelin-stratcom',
@@ -2016,12 +2022,6 @@
     'cd2b9b77' => array(
       'phui-oi-list-view-css',
     ),
-    'd02f7181' => array(
-      'javelin-install',
-      'javelin-util',
-      'javelin-dom',
-      'javelin-vector',
-    ),
     'd0c516d5' => array(
       'javelin-behavior',
       'javelin-dom',
diff --git a/webroot/rsrc/css/aphront/tooltip.css b/webroot/rsrc/css/aphront/tooltip.css
--- a/webroot/rsrc/css/aphront/tooltip.css
+++ b/webroot/rsrc/css/aphront/tooltip.css
@@ -5,8 +5,25 @@
 .jx-tooltip-container {
   position: absolute;
   padding: 5px;
-  opacity: 1;
-  transition: opacity 0.25s ease;
+}
+
+.jx-tooltip-appear {
+  animation: 0.5s tooltip-appear;
+
+  /* Without this, there's a nasty pop-in effect at the end of the animation
+     when Safari changes font smoothing. The text becomes visibly more bold
+     after the last frame of animation. */
+  -webkit-font-smoothing: subpixel-antialiased;
+}
+
+@keyframes tooltip-appear {
+  0% {
+    opacity: 0;
+  }
+
+  100% {
+    opacity: 1;
+  }
 }
 
 .jx-tooltip-hidden {
diff --git a/webroot/rsrc/js/core/ToolTip.js b/webroot/rsrc/js/core/ToolTip.js
--- a/webroot/rsrc/js/core/ToolTip.js
+++ b/webroot/rsrc/js/core/ToolTip.js
@@ -11,6 +11,7 @@
 
   statics: {
     _node: null,
+    _last: null,
     _lock: 0,
 
     show : function(root, scale, align, content) {
@@ -46,7 +47,7 @@
 
       var node = JX.$N(
         'div',
-        { className: 'jx-tooltip-container jx-tooltip-hidden' },
+        { className: 'jx-tooltip-container' },
         node_inner);
 
       node.style.maxWidth  = scale + 'px';
@@ -61,7 +62,28 @@
       // Jump through some hoops trying to auto-position the tooltip
       var pos = self._getSmartPosition(align, root, node);
       pos.setPos(node);
-      JX.DOM.alterClass(node, 'jx-tooltip-hidden', false);
+
+      // Animate the tip if we haven't shown any tips recently. If we are
+      // already showing a tip (or hid one very recently) just show the tip
+      // immediately. This makes hunting for a particular item by mousing
+      // through tips smoother: you only have to sit through the animation
+      // once, at the beginning.
+
+      var is_recent = false;
+
+      var last_tip = self._last;
+      if (last_tip) {
+        // If we recently hid a tip, compute how many milliseconds ago we
+        // hid it.
+        var last_tip_age = (new Date().getTime() - self._last);
+        if (last_tip_age < 500) {
+          is_recent = true;
+        }
+      }
+
+      if (!is_recent) {
+        JX.DOM.alterClass(node, 'jx-tooltip-appear', true);
+      }
     },
 
     _getSmartPosition: function (align, root, node) {
@@ -194,6 +216,7 @@
       if (this._node) {
         JX.DOM.remove(this._node);
         this._node = null;
+        this._last = new Date().getTime();
       }
     },