diff --git a/openide.filesystems/src/org/openide/filesystems/JarFileSystem.java b/openide.filesystems/src/org/openide/filesystems/JarFileSystem.java
--- a/openide.filesystems/src/org/openide/filesystems/JarFileSystem.java
+++ b/openide.filesystems/src/org/openide/filesystems/JarFileSystem.java
@@ -100,6 +100,11 @@
     /** maxsize for passing ByteArrayInputStream*/
     private static final long MEM_STREAM_SIZE = 100000;
 
+    /** Maximal time for which closing of jar is postponed. */
+    private static final int CLOSE_DELAY_MAX = 5000;
+    /** Mininal time for which closing of jar is postponed. */
+    private static final int CLOSE_DELAY_MIN = 300;
+
     /**
     * Opened zip file of this filesystem is stored here or null.
     */
@@ -138,6 +143,11 @@
     private transient FileObject foRoot;
     private transient FileChangeListener fcl;
 
+    /** Actual time for which closing of jar is postponed. */
+    private transient int closeDelay = CLOSE_DELAY_MIN;
+    /** Time of request for opening of jar. */
+    private transient long openRequestTime = 0;
+
     /**
     * Default constructor.
      * <p><strong>Most module code should never create an instance of this class directly.</strong>
@@ -282,6 +292,7 @@
 
             closeCurrentRoot(false);
             jar = tempJar;
+            openRequestTime = System.currentTimeMillis();
             root = new File(s);
 
             if (refreshRoot) {
@@ -671,6 +682,13 @@
                 closeTask.cancel();
             }
 
+            // #167527 - calculate adaptive delay before closing jar
+            long now = System.currentTimeMillis();
+            long requestPeriod = now - openRequestTime;
+            openRequestTime = now;
+            // 150% of time from last open request, but between CLOSE_DELAY_MIN and CLOSE_DELAY_MAX
+            closeDelay = (int) Math.min(CLOSE_DELAY_MAX, Math.max(CLOSE_DELAY_MIN, (1.5 * requestPeriod)));
+
             JarFile j = jar;
 
             if (j != null) {
@@ -698,7 +716,7 @@
             if (isRealClose) {
                 realClose().run();
             } else {
-                closeTask = req.post(realClose(), 300);
+                closeTask = req.post(realClose(), closeDelay);
             }
         }
     }