diff --git a/app/src/main/java/eu/faircode/netguard/ActivityDns.java b/app/src/main/java/eu/faircode/netguard/ActivityDns.java
index eaa2a275..290eb81d 100644
--- a/app/src/main/java/eu/faircode/netguard/ActivityDns.java
+++ b/app/src/main/java/eu/faircode/netguard/ActivityDns.java
@@ -95,7 +95,7 @@ public class ActivityDns extends AppCompatActivity {
                 ServiceSinkhole.reload("DNS cleanup", ActivityDns.this);
                 updateAdapter();
             }
-        }.execute();
+        }.executeOnExecutor(AsyncTask.THREAD_POOL_EXECUTOR);
     }
 
     private void clear() {
@@ -112,7 +112,7 @@ public class ActivityDns extends AppCompatActivity {
                 ServiceSinkhole.reload("DNS clear", ActivityDns.this);
                 updateAdapter();
             }
-        }.execute();
+        }.executeOnExecutor(AsyncTask.THREAD_POOL_EXECUTOR);
     }
 
     private void updateAdapter() {
diff --git a/app/src/main/java/eu/faircode/netguard/ActivityForwarding.java b/app/src/main/java/eu/faircode/netguard/ActivityForwarding.java
index 27e7b09e..6f88268a 100644
--- a/app/src/main/java/eu/faircode/netguard/ActivityForwarding.java
+++ b/app/src/main/java/eu/faircode/netguard/ActivityForwarding.java
@@ -179,7 +179,7 @@ public class ActivityForwarding extends AppCompatActivity {
                         spRuid.setVisibility(View.VISIBLE);
                     }
                 };
-                task.execute();
+                task.executeOnExecutor(AsyncTask.THREAD_POOL_EXECUTOR);
 
                 dialog = new AlertDialog.Builder(this)
                         .setView(view)
@@ -223,7 +223,7 @@ public class ActivityForwarding extends AppCompatActivity {
                                                 } else
                                                     Toast.makeText(ActivityForwarding.this, ex.toString(), Toast.LENGTH_LONG).show();
                                         }
-                                    }.execute();
+                                    }.executeOnExecutor(AsyncTask.THREAD_POOL_EXECUTOR);
                                 } catch (Throwable ex) {
                                     Toast.makeText(ActivityForwarding.this, ex.toString(), Toast.LENGTH_LONG).show();
                                 }
diff --git a/app/src/main/java/eu/faircode/netguard/ActivityLog.java b/app/src/main/java/eu/faircode/netguard/ActivityLog.java
index 770d2d6b..d6b76c7d 100644
--- a/app/src/main/java/eu/faircode/netguard/ActivityLog.java
+++ b/app/src/main/java/eu/faircode/netguard/ActivityLog.java
@@ -497,7 +497,7 @@ public class ActivityLog extends AppCompatActivity implements SharedPreferences.
                         if (running)
                             updateAdapter();
                     }
-                }.execute();
+                }.executeOnExecutor(AsyncTask.THREAD_POOL_EXECUTOR);
                 return true;
 
             case R.id.menu_log_support:
@@ -620,6 +620,6 @@ public class ActivityLog extends AppCompatActivity implements SharedPreferences.
                 else
                     Toast.makeText(ActivityLog.this, ex.toString(), Toast.LENGTH_LONG).show();
             }
-        }.execute();
+        }.executeOnExecutor(AsyncTask.THREAD_POOL_EXECUTOR);
     }
 }
diff --git a/app/src/main/java/eu/faircode/netguard/ActivityMain.java b/app/src/main/java/eu/faircode/netguard/ActivityMain.java
index cae134af..909eda22 100644
--- a/app/src/main/java/eu/faircode/netguard/ActivityMain.java
+++ b/app/src/main/java/eu/faircode/netguard/ActivityMain.java
@@ -118,18 +118,6 @@ public class ActivityMain extends AppCompatActivity implements SharedPreferences
     public static final String EXTRA_METERED = "Metered";
     public static final String EXTRA_SIZE = "Size";
 
-    private static ExecutorService mExecutor = Executors.newFixedThreadPool(Runtime.getRuntime().availableProcessors(),
-            new PriorityThreadFactory());
-
-    private static class PriorityThreadFactory implements ThreadFactory {
-        @Override
-        public Thread newThread(Runnable r) {
-            Thread t = new Thread(r);
-            t.setPriority(Thread.MAX_PRIORITY);
-            return t;
-        }
-    }
-
     @Override
     protected void onCreate(Bundle savedInstanceState) {
         Log.i(TAG, "Create version=" + Util.getSelfVersionName(this) + "/" + Util.getSelfVersionCode(this));
@@ -1063,7 +1051,7 @@ public class ActivityMain extends AppCompatActivity implements SharedPreferences
                     }
                 }
             }
-        }.execute(mExecutor);
+        }.executeOnExecutor(AsyncTask.THREAD_POOL_EXECUTOR);
     }
 
     private void updateSearch(String search) {
diff --git a/app/src/main/java/eu/faircode/netguard/ActivitySettings.java b/app/src/main/java/eu/faircode/netguard/ActivitySettings.java
index ecb56d0e..9942eb21 100644
--- a/app/src/main/java/eu/faircode/netguard/ActivitySettings.java
+++ b/app/src/main/java/eu/faircode/netguard/ActivitySettings.java
@@ -201,7 +201,7 @@ public class ActivitySettings extends AppCompatActivity implements SharedPrefere
                                 else
                                     Toast.makeText(ActivitySettings.this, ex.toString(), Toast.LENGTH_LONG).show();
                             }
-                        }.execute();
+                        }.executeOnExecutor(AsyncTask.THREAD_POOL_EXECUTOR);
                     }
                 });
                 return false;
@@ -376,7 +376,7 @@ public class ActivitySettings extends AppCompatActivity implements SharedPrefere
                                 if (running)
                                     Toast.makeText(ActivitySettings.this, ex.getMessage(), Toast.LENGTH_LONG).show();
                             }
-                        }).execute();
+                        }).executeOnExecutor(AsyncTask.THREAD_POOL_EXECUTOR);
                     } catch (MalformedURLException ex) {
                         Toast.makeText(ActivitySettings.this, ex.toString(), Toast.LENGTH_LONG).show();
                     }
@@ -1015,7 +1015,7 @@ public class ActivitySettings extends AppCompatActivity implements SharedPrefere
                         Toast.makeText(ActivitySettings.this, ex.toString(), Toast.LENGTH_LONG).show();
                 }
             }
-        }.execute();
+        }.executeOnExecutor(AsyncTask.THREAD_POOL_EXECUTOR);
     }
 
     private void handleHosts(final Intent data) {
@@ -1082,7 +1082,7 @@ public class ActivitySettings extends AppCompatActivity implements SharedPrefere
                         Toast.makeText(ActivitySettings.this, ex.toString(), Toast.LENGTH_LONG).show();
                 }
             }
-        }.execute();
+        }.executeOnExecutor(AsyncTask.THREAD_POOL_EXECUTOR);
     }
 
     private void handleImport(final Intent data) {
@@ -1124,7 +1124,7 @@ public class ActivitySettings extends AppCompatActivity implements SharedPrefere
                         Toast.makeText(ActivitySettings.this, ex.toString(), Toast.LENGTH_LONG).show();
                 }
             }
-        }.execute();
+        }.executeOnExecutor(AsyncTask.THREAD_POOL_EXECUTOR);
     }
 
     private void xmlExport(OutputStream out) throws IOException {
diff --git a/app/src/main/java/eu/faircode/netguard/AdapterAccess.java b/app/src/main/java/eu/faircode/netguard/AdapterAccess.java
index b3c93a5c..095cb450 100644
--- a/app/src/main/java/eu/faircode/netguard/AdapterAccess.java
+++ b/app/src/main/java/eu/faircode/netguard/AdapterAccess.java
@@ -161,7 +161,7 @@ public class AdapterAccess extends CursorAdapter {
                                     " >" + addr + (dport > 0 ? "/" + dport : ""));
                     ViewCompat.setHasTransientState(tvDest, false);
                 }
-            }.execute(daddr);
+            }.executeOnExecutor(AsyncTask.THREAD_POOL_EXECUTOR, daddr);
 
         if (allowed < 0)
             tvDest.setTextColor(colorText);
diff --git a/app/src/main/java/eu/faircode/netguard/AdapterLog.java b/app/src/main/java/eu/faircode/netguard/AdapterLog.java
index a2726561..c4af2f25 100644
--- a/app/src/main/java/eu/faircode/netguard/AdapterLog.java
+++ b/app/src/main/java/eu/faircode/netguard/AdapterLog.java
@@ -265,7 +265,7 @@ public class AdapterLog extends CursorAdapter {
                         tvDaddr.setText(">" + name);
                         ViewCompat.setHasTransientState(tvDaddr, false);
                     }
-                }.execute(daddr);
+                }.executeOnExecutor(AsyncTask.THREAD_POOL_EXECUTOR, daddr);
             } else
                 tvDaddr.setText(dname);
         else
@@ -299,7 +299,7 @@ public class AdapterLog extends CursorAdapter {
                         }
                         ViewCompat.setHasTransientState(tvOrganization, false);
                     }
-                }.execute(daddr);
+                }.executeOnExecutor(AsyncTask.THREAD_POOL_EXECUTOR, daddr);
         }
 
         // Show extra data
diff --git a/app/src/main/java/eu/faircode/netguard/AdapterRule.java b/app/src/main/java/eu/faircode/netguard/AdapterRule.java
index bea7bc66..ec7e3ba2 100644
--- a/app/src/main/java/eu/faircode/netguard/AdapterRule.java
+++ b/app/src/main/java/eu/faircode/netguard/AdapterRule.java
@@ -749,7 +749,7 @@ public class AdapterRule extends RecyclerView.Adapter<AdapterRule.ViewHolder> im
                                         rule.hosts = hosts;
                                         notifyDataSetChanged();
                                     }
-                                }.execute();
+                                }.executeOnExecutor(AsyncTask.THREAD_POOL_EXECUTOR);
 
                             return result;
                         }
diff --git a/app/src/main/java/eu/faircode/netguard/Util.java b/app/src/main/java/eu/faircode/netguard/Util.java
index ed553eac..dfe7f958 100644
--- a/app/src/main/java/eu/faircode/netguard/Util.java
+++ b/app/src/main/java/eu/faircode/netguard/Util.java
@@ -972,7 +972,7 @@ public class Util {
                     }
             }
         };
-        task.execute();
+        task.executeOnExecutor(AsyncTask.THREAD_POOL_EXECUTOR);
     }
 
     private static StringBuilder getTrafficLog(Context context) {