IDEA-205534 Typing lags in plugins search UI

platform/platform-impl/src/com/intellij/ide/plugins/PluginManagerConfigurableNew.java

@@ -136,6 +136,7 @@ public class PluginManagerConfigurableNew
   private Map<String, List<IdeaPluginDescriptor>> myCustomRepositoriesMap;
   private final Object myRepositoriesLock = new Object();
   private List<String> myAllTagSorted;
+  private Map<String, List<IdeaPluginDescriptor>> mySuggestCache;
 
   private boolean myIgnoreFocusFromBackButton;
 
@@ -1033,7 +1034,7 @@ public class PluginManagerConfigurableNew
           return;
         }
 
-        List<IdeaPluginDescriptor> result = loadSuggestPlugins(query);
+        List<IdeaPluginDescriptor> result = getSuggestPlugins(query);
         if (result.isEmpty()) {
           hidePopup();
           return;
@@ -1087,6 +1088,23 @@ public class PluginManagerConfigurableNew
         myPopup.createAndShow(callback, renderer, async);
       }
 
+      @NotNull
+      private List<IdeaPluginDescriptor> getSuggestPlugins(@NotNull String query) {
+        if (mySuggestCache == null) {
+          mySuggestCache = new HashMap<>();
+        }
+
+        List<IdeaPluginDescriptor> result = mySuggestCache.get(query);
+        if (result == null) {
+          result = loadSuggestPlugins(query);
+          if (!query.isEmpty() && !result.isEmpty()) {
+            mySuggestCache.put(query, result);
+          }
+        }
+
+        return result;
+      }
+
       @NotNull
       private List<IdeaPluginDescriptor> loadSuggestPlugins(@NotNull String query) {
         Set<IdeaPluginDescriptor> result = new LinkedHashSet<>();
@@ -1314,6 +1332,8 @@ public class PluginManagerConfigurableNew
       myCustomRepositoriesMap = null;
     }
 
+    mySuggestCache = null;
+
     myPluginUpdatesService.recalculateUpdates();
 
     if (myTrendingPanel == null && myUpdatesPanel == null) {