Animation dropdown menus

I don't know whether this is a good idea; the menus feel too slow and
puffy to me.

core/ui/MissingTemplate.tid

@@ -1,7 +1,7 @@
 title: $:/core/ui/MissingTemplate
 
 <div class="tw-tiddler-missing"><$button popup="$:/state/missingpopup" qualifyTiddlerTitles="yes" class="btn-invisible tw-missing-tiddler-label"><$view field="title" format="text" /></$button>
-<$reveal state="$:/state/missingpopup" type="popup" position="below" qualifyTiddlerTitles="yes"><div class="tw-drop-down">
+<$reveal state="$:/state/missingpopup" type="popup" position="below" qualifyTiddlerTitles="yes" animate="yes"><div class="tw-drop-down">
 <$transclude tiddler="$:/core/ui/ListItemTemplate"/>
 <hr>
 <$list filter="[is[current]backlinks[]sort[title]]" template="$:/core/ui/ListItemTemplate"/>

core/ui/TagTemplate.tid

@@ -4,7 +4,7 @@ title: $:/core/ui/TagTemplate
 background-color:$(backgroundColor)$;
 \end
 <span class="tw-tag-list-item"><$setvariable name="backgroundColor" value={{!!color}}><$button popup="$:/state/tagpopup" qualifyTiddlerTitles="yes" class="btn-invisible tw-tag-label" style=<<tag-styles>>><$transclude tiddler={{!!icon}}/> <$view field="title" format="text" /></$button></$setvariable>
-<$reveal state="$:/state/tagpopup" type="popup" position="below" qualifyTiddlerTitles="yes"><div class="tw-drop-down"><$transclude tiddler="$:/core/ui/ListItemTemplate"/>
+<$reveal state="$:/state/tagpopup" type="popup" position="below" qualifyTiddlerTitles="yes" animate="yes"><div class="tw-drop-down"><$transclude tiddler="$:/core/ui/ListItemTemplate"/>
 <hr>
 <$list filter="[is[current]tagging[]]" template="$:/core/ui/ListItemTemplate"/>
 </div></$reveal></span>