diff --git a/HISTORY.md b/HISTORY.md
index eacc1c69..108ce403 100755
--- a/HISTORY.md
+++ b/HISTORY.md
@@ -43,6 +43,7 @@
 * Objects: tweaked spec for settings getter
 * Blocks: improved dropping command blocks into reporter rings
 * Morphic: simplified and optimized Node>>parentThatIsA / parentThatIsAnyOf
+* Blocks, Lists, Tables: refactored for optimized parent-by-type detection
 
 ### 2019-02-06
 * Blocks, BYOB: refactored custom block input options and drop-down menus
diff --git a/snap.html b/snap.html
index 22dd7751..7fee31d2 100755
--- a/snap.html
+++ b/snap.html
@@ -6,14 +6,14 @@
         <link rel="shortcut icon" href="src/favicon.ico">
         <script type="text/javascript" src="src/morphic.js?version=2019-02-07"></script>
         <script type="text/javascript" src="src/widgets.js?version=2018-10-02"></script>
-        <script type="text/javascript" src="src/blocks.js?version=2019-02-06"></script>
+        <script type="text/javascript" src="src/blocks.js?version=2019-02-07"></script>
         <script type="text/javascript" src="src/threads.js?version=2019-01-28"></script>
         <script type="text/javascript" src="src/objects.js?version=2019-02-07"></script>
         <script type="text/javascript" src="src/gui.js?version=2019-02-06"></script>
         <script type="text/javascript" src="src/paint.js?version=2018-10-02"></script>
-        <script type="text/javascript" src="src/lists.js?version=2019-01-10"></script>
+        <script type="text/javascript" src="src/lists.js?version=2019-02-07"></script>
         <script type="text/javascript" src="src/byob.js?version=2019-02-06"></script>
-        <script type="text/javascript" src="src/tables.js?version=2018-10-02"></script>
+        <script type="text/javascript" src="src/tables.js?version=2019-02-07"></script>
         <script type="text/javascript" src="src/symbols.js?version=2019-01-14"></script>
         <script type="text/javascript" src="src/sketch.js?version=2018-10-02"></script>
         <script type="text/javascript" src="src/xml.js?version=2018-11-12"></script>
diff --git a/src/blocks.js b/src/blocks.js
index 2fb18a92..02adab70 100644
--- a/src/blocks.js
+++ b/src/blocks.js
@@ -148,7 +148,7 @@ CustomCommandBlockMorph, SymbolMorph, ToggleButtonMorph, DialMorph*/
 
 // Global stuff ////////////////////////////////////////////////////////
 
-modules.blocks = '2019-February-06';
+modules.blocks = '2019-February-07';
 
 var SyntaxElementMorph;
 var BlockMorph;
@@ -1966,8 +1966,10 @@ SyntaxElementMorph.prototype.fixLayout = function (silently) {
             }
         }
         if (this.width() !== initialExtent.x) {
-            affected = this.parentThatIsAnyOf(
-                [ReporterBlockMorph, CommandSlotMorph, RingCommandSlotMorph]
+            affected = this.parentThatIsA(
+                ReporterBlockMorph,
+                CommandSlotMorph,
+                RingCommandSlotMorph
             );
             if (affected) {
                 affected.fixLayout();
diff --git a/src/lists.js b/src/lists.js
index ad207dd3..5af8170b 100644
--- a/src/lists.js
+++ b/src/lists.js
@@ -62,7 +62,7 @@ CellMorph, ArrowMorph, MenuMorph, snapEquals, Morph, isNil, localize, isString,
 MorphicPreferences, TableDialogMorph, SpriteBubbleMorph, SpeechBubbleMorph,
 TableFrameMorph, TableMorph, Variable, isSnapObject*/
 
-modules.lists = '2019-January-10';
+modules.lists = '2019-February-07';
 
 var List;
 var ListWatcherMorph;
@@ -924,11 +924,11 @@ ListWatcherMorph.prototype.userMenu = function () {
 };
 
 ListWatcherMorph.prototype.showTableView = function () {
-    var view = this.parentThatIsAnyOf([
+    var view = this.parentThatIsA(
         SpriteBubbleMorph,
         SpeechBubbleMorph,
         CellMorph
-    ]);
+    );
     if (!view) {return; }
     if (view instanceof SpriteBubbleMorph) {
         view.changed();
diff --git a/src/tables.js b/src/tables.js
index 69c3d8fc..ce88155f 100644
--- a/src/tables.js
+++ b/src/tables.js
@@ -70,7 +70,7 @@ SpriteMorph, Context, Costume, ArgMorph, BlockEditorMorph, SymbolMorph,
 SyntaxElementMorph, MenuMorph, SpriteBubbleMorph, SpeechBubbleMorph, Sound,
 CellMorph, ListWatcherMorph, isNil, BoxMorph, Variable, isSnapObject*/
 
-modules.tables = '2017-September-01';
+modules.tables = '2019-February-07';
 
 var Table;
 var TableCellMorph;
@@ -1059,11 +1059,11 @@ TableMorph.prototype.openInDialog = function () {
 };
 
 TableMorph.prototype.showListView = function () {
-    var view = this.parentThatIsAnyOf([
+    var view = this.parentThatIsA(
         SpriteBubbleMorph,
         SpeechBubbleMorph,
         CellMorph
-    ]);
+    );
     if (!view) {return; }
     if (view instanceof SpriteBubbleMorph) {
         view.changed();