diff --git a/app/src/main/java/ru/ytkab0bp/slicebeam/SetupActivity.java b/app/src/main/java/ru/ytkab0bp/slicebeam/SetupActivity.java
index fd2ebeb..6f78c2d 100644
--- a/app/src/main/java/ru/ytkab0bp/slicebeam/SetupActivity.java
+++ b/app/src/main/java/ru/ytkab0bp/slicebeam/SetupActivity.java
@@ -370,14 +370,15 @@ public class SetupActivity extends AppCompatActivity {
         backgroundView.setEGLContextClientVersion(3);
         backgroundView.setRenderer(new GLSurfaceView.Renderer() {
             @Override
-            public void onSurfaceCreated(GL10 gl, EGLConfig config) {
-                backgroundModel = new GLModel();
-                backgroundModel.initBackgroundTriangles();
-            }
+            public void onSurfaceCreated(GL10 gl, EGLConfig config) {}
 
             @Override
             public void onSurfaceChanged(GL10 gl, int width, int height) {
                 glViewport(0, 0, width, height);
+                if (backgroundModel == null) {
+                    backgroundModel = new GLModel();
+                    backgroundModel.initBackgroundTriangles();
+                }
             }
 
             private float time;
diff --git a/app/src/main/java/ru/ytkab0bp/slicebeam/boot/AppBoot.java b/app/src/main/java/ru/ytkab0bp/slicebeam/boot/AppBoot.java
index 15516bc..6d01c27 100644
--- a/app/src/main/java/ru/ytkab0bp/slicebeam/boot/AppBoot.java
+++ b/app/src/main/java/ru/ytkab0bp/slicebeam/boot/AppBoot.java
@@ -11,7 +11,11 @@ import java.util.concurrent.ExecutorService;
 import java.util.concurrent.Executors;
 import java.util.concurrent.TimeUnit;
 
+import ru.ytkab0bp.slicebeam.BuildConfig;
+
 public class AppBoot {
+    private final static String TAG = "boot";
+
     static ExecutorService executor = Executors.newCachedThreadPool();
     static List<BootTask> tasks;
     static List<Runnable> pendingMain = new ArrayList<>();
@@ -49,7 +53,9 @@ public class AppBoot {
                     pendingMain.removeAll(clone);
                 }
             }
-            Log.d("boot", "Boot in " + (System.currentTimeMillis() - start) + "ms");
+            if (BuildConfig.DEBUG) {
+                Log.d(TAG, "Boot in " + (System.currentTimeMillis() - start) + "ms");
+            }
             tryShutdown();
         } catch (InterruptedException e) {
             throw new RuntimeException(e);
@@ -70,34 +76,29 @@ public class AppBoot {
 
     private static void tryRunTask(BootTask task, boolean fromMain, boolean isContinue) {
         if (checkDependencies(task.dependencies)) {
+            Runnable r = () -> {
+                try {
+                    task.run.run();
+                } catch (Exception e) {
+                    Log.e(TAG, "Error while executing boot task", e);
+                }
+                completed.put(task.index, true);
+                if (BuildConfig.DEBUG) {
+                    Log.d(TAG, "Finish " + task);
+                }
+                if (!task.nonCritical) {
+                    latch.countDown();
+                } else {
+                    tryShutdown();
+                }
+
+                if (!isContinue) {
+                    continueTasks(fromMain);
+                }
+            };
             if (task.workerThread) {
-                executor.submit(() -> {
-                    task.run.run();
-                    completed.put(task.index, true);
-                    if (!task.nonCritical) {
-                        latch.countDown();
-                    } else {
-                        tryShutdown();
-                    }
-
-                    if (!isContinue) {
-                        continueTasks(fromMain);
-                    }
-                });
+                executor.submit(r);
             } else {
-                Runnable r = () -> {
-                    task.run.run();
-                    completed.put(task.index, true);
-                    if (!task.nonCritical) {
-                        latch.countDown();
-                    } else {
-                        tryShutdown();
-                    }
-
-                    if (!isContinue) {
-                        continueTasks(fromMain);
-                    }
-                };
                 if (fromMain) {
                     r.run();
                 } else {
diff --git a/app/src/main/java/ru/ytkab0bp/slicebeam/boot/BeamServerDataTask.java b/app/src/main/java/ru/ytkab0bp/slicebeam/boot/BeamServerDataTask.java
index 7c6157d..a7019b4 100644
--- a/app/src/main/java/ru/ytkab0bp/slicebeam/boot/BeamServerDataTask.java
+++ b/app/src/main/java/ru/ytkab0bp/slicebeam/boot/BeamServerDataTask.java
@@ -6,6 +6,7 @@ import org.json.JSONObject;
 import ru.ytkab0bp.slicebeam.BeamServerData;
 import ru.ytkab0bp.slicebeam.SliceBeam;
 import ru.ytkab0bp.slicebeam.utils.Prefs;
+import ru.ytkab0bp.slicebeam.utils.ViewUtils;
 
 public class BeamServerDataTask extends BootTask {
     public BeamServerDataTask() {
@@ -16,7 +17,7 @@ public class BeamServerDataTask extends BootTask {
                 throw new RuntimeException(e);
             }
             if (System.currentTimeMillis() - Prefs.getLastCheckedInfo() >= 86400000L) {
-                BeamServerData.load();
+                ViewUtils.postOnMainThread(BeamServerData::load);
             }
         });
         onWorker();
diff --git a/app/src/main/java/ru/ytkab0bp/slicebeam/fragment/BedFragment.java b/app/src/main/java/ru/ytkab0bp/slicebeam/fragment/BedFragment.java
index c5c5b76..439f806 100644
--- a/app/src/main/java/ru/ytkab0bp/slicebeam/fragment/BedFragment.java
+++ b/app/src/main/java/ru/ytkab0bp/slicebeam/fragment/BedFragment.java
@@ -1,18 +1,30 @@
 package ru.ytkab0bp.slicebeam.fragment;
 
+import android.animation.Animator;
+import android.animation.AnimatorListenerAdapter;
 import android.annotation.SuppressLint;
 import android.app.Activity;
 import android.content.Context;
+import android.content.res.ColorStateList;
 import android.os.Process;
 import android.text.TextUtils;
 import android.util.DisplayMetrics;
 import android.util.Log;
 import android.util.SparseArray;
+import android.util.TypedValue;
+import android.view.Gravity;
 import android.view.View;
 import android.view.ViewGroup;
+import android.webkit.WebChromeClient;
+import android.webkit.WebResourceRequest;
+import android.webkit.WebResourceResponse;
 import android.webkit.WebView;
+import android.webkit.WebViewClient;
 import android.widget.FrameLayout;
+import android.widget.ImageView;
 import android.widget.LinearLayout;
+import android.widget.ProgressBar;
+import android.widget.TextView;
 
 import androidx.dynamicanimation.animation.FloatValueHolder;
 import androidx.dynamicanimation.animation.SpringAnimation;
@@ -105,6 +117,10 @@ public class BedFragment extends Fragment {
 
     private BedSwipeDownLayout swipeDownLayout;
     private WebView panelWebView;
+    private LinearLayout panelWebViewError;
+    private ImageView webViewErrIcon;
+    private TextView webViewErrDescription;
+    private ProgressBar webViewProgressBar;
 
     private static String tempFileName;
     private static File tempExportingFile;
@@ -228,7 +244,15 @@ public class BedFragment extends Fragment {
             if (!host.startsWith("http://")) {
                 host = "http://" + host;
             }
+            webViewProgressBar.animate().alpha(1).setDuration(150).start();
+            panelWebView.setAlpha(0f);
             panelWebView.loadUrl(host);
+            panelWebViewError.animate().alpha(0).setDuration(150).setListener(new AnimatorListenerAdapter() {
+                @Override
+                public void onAnimationEnd(Animator animation) {
+                    panelWebViewError.setVisibility(View.GONE);
+                }
+            }).start();
         }
     }
 
@@ -272,6 +296,44 @@ public class BedFragment extends Fragment {
         swipeDownLayout = new BedSwipeDownLayout(ctx);
         panelWebView = new WebView(ctx);
         panelWebView.getSettings().setJavaScriptEnabled(true);
+        panelWebView.setWebViewClient(new WebViewClient() {
+            @Override
+            public void onReceivedError(WebView view, int errorCode, String description, String failingUrl) {
+                webViewErrDescription.setText(description);
+                panelWebViewError.setVisibility(View.VISIBLE);
+                panelWebViewError.setAlpha(0f);
+                panelWebViewError.animate().alpha(1).setDuration(150).setListener(null).start();
+                webViewProgressBar.animate().alpha(0).setDuration(150).start();
+            }
+
+            @Override
+            public void onPageFinished(WebView view, String url) {
+                panelWebView.animate().alpha(0).setDuration(150).start();
+                webViewProgressBar.animate().alpha(0).setDuration(150).start();
+            }
+        });
+
+        FrameLayout wfl = new FrameLayout(ctx);
+        wfl.addView(panelWebView, new FrameLayout.LayoutParams(ViewGroup.LayoutParams.MATCH_PARENT, ViewGroup.LayoutParams.MATCH_PARENT));
+        panelWebViewError = new LinearLayout(ctx);
+        panelWebViewError.setVisibility(View.GONE);
+        panelWebViewError.setOrientation(LinearLayout.VERTICAL);
+        panelWebViewError.setGravity(Gravity.CENTER);
+        panelWebViewError.setPadding(ViewUtils.dp(12), ViewUtils.dp(12), ViewUtils.dp(12), ViewUtils.dp(12));
+        webViewErrIcon = new ImageView(ctx);
+        webViewErrIcon.setImageResource(R.drawable.globe_cross_outline_28);
+        panelWebViewError.addView(webViewErrIcon, new LinearLayout.LayoutParams(ViewUtils.dp(28), ViewUtils.dp(28)) {{
+            bottomMargin = ViewUtils.dp(8);
+        }});
+        webViewErrDescription = new TextView(ctx);
+        webViewErrDescription.setTextSize(TypedValue.COMPLEX_UNIT_DIP, 16);
+        webViewErrDescription.setGravity(Gravity.CENTER);
+        panelWebViewError.addView(webViewErrDescription);
+        wfl.addView(panelWebViewError, new LinearLayout.LayoutParams(ViewGroup.LayoutParams.MATCH_PARENT, ViewGroup.LayoutParams.MATCH_PARENT));
+
+        webViewProgressBar = new ProgressBar(ctx);
+        webViewProgressBar.setAlpha(0f);
+        wfl.addView(webViewProgressBar, new FrameLayout.LayoutParams(ViewUtils.dp(36), ViewUtils.dp(36), Gravity.CENTER));
 
         if (portrait) {
             LinearLayout inner = new LinearLayout(ctx);
@@ -280,10 +342,10 @@ public class BedFragment extends Fragment {
 
             inner.addView(glView, new LinearLayout.LayoutParams(ViewGroup.LayoutParams.MATCH_PARENT, 0, 1f));
             swipeDownLayout.addView(inner);
-            swipeDownLayout.addView(panelWebView);
+            swipeDownLayout.addView(wfl);
         } else {
             swipeDownLayout.addView(glView);
-            swipeDownLayout.addView(panelWebView);
+            swipeDownLayout.addView(wfl);
             ll.addView(swipeDownLayout, new LinearLayout.LayoutParams(0, ViewGroup.LayoutParams.MATCH_PARENT, 1f));
         }
 
@@ -536,6 +598,9 @@ public class BedFragment extends Fragment {
     public void onApplyTheme() {
         super.onApplyTheme();
 
+        webViewErrIcon.setImageTintList(ColorStateList.valueOf(ThemesRepo.getColor(android.R.attr.textColorSecondary)));
+        webViewErrDescription.setTextColor(ThemesRepo.getColor(android.R.attr.textColorSecondary));
+        webViewProgressBar.setIndeterminateTintList(ColorStateList.valueOf(ThemesRepo.getColor(android.R.attr.textColorSecondary)));
         menuView.setBackgroundColor(ThemesRepo.getColor(android.R.attr.windowBackground));
         for (int i = 0; i < MenuCategory.values().length; i++) {
             if (i != currentMenuSlot) {
diff --git a/app/src/main/jni/slicebeam/beam_native.cpp b/app/src/main/jni/slicebeam/beam_native.cpp
index d040446..a4b6ca3 100644
--- a/app/src/main/jni/slicebeam/beam_native.cpp
+++ b/app/src/main/jni/slicebeam/beam_native.cpp
@@ -820,7 +820,7 @@ extern "C" {
     JNIEXPORT jboolean JNICALL Java_ru_ytkab0bp_slicebeam_slic3r_Native_model_1is_1big_1object(JNIEnv* env, jclass, jlong ptr, jint i) {
         ModelRef* model = (ModelRef*) (intptr_t) ptr;
         ModelObject* obj = model->model.objects[i];
-        return obj->volumes.size() == 1 && obj->volumes.front()->mesh().its.indices.size() >= 100000;
+        return obj->volumes.size() == 1 && obj->volumes.front()->mesh().its.indices.size() >= 500000;
     }
 
     JNIEXPORT jint JNICALL Java_ru_ytkab0bp_slicebeam_slic3r_Native_model_1get_1extruder(JNIEnv* env, jclass, jlong ptr, jint i) {
diff --git a/app/src/main/res/drawable/globe_cross_outline_28.xml b/app/src/main/res/drawable/globe_cross_outline_28.xml
new file mode 100644
index 0000000..fe4b292
--- /dev/null
+++ b/app/src/main/res/drawable/globe_cross_outline_28.xml
@@ -0,0 +1,10 @@
+<vector xmlns:android="http://schemas.android.com/apk/res/android"
+    android:width="28dp"
+    android:height="28dp"
+    android:viewportWidth="28"
+    android:viewportHeight="28">
+  <path
+      android:pathData="M12.119,4.173a10.017,10.017 0,0 0,-6.835 4.92h4.58a20.109,20.109 0,0 1,2.255 -4.92ZM11.418,11.093h6.004a1,1 0,0 0,0.933 -1.36c-0.576,-1.922 -1.474,-3.927 -2.416,-5.55a10.024,10.024 0,0 1,7.41 6.231l0.012,0.035a1,1 0,1 0,1.87 -0.71l-0.016,-0.042c-1.73,-4.503 -6.095,-7.701 -11.21,-7.701C7.375,1.996 2,7.37 2,14c0,5.126 3.212,9.499 7.73,11.22a1,1 0,0 0,0.712 -1.868,10.04 10.04,0 0,1 -5.158,-4.445L9.5,18.907a1,1 0,1 0,0 -2L4.429,16.907A10.005,10.005 0,0 1,4 14c0,-1.011 0.15,-1.987 0.429,-2.907h4.95a17.64,17.64 0,0 0,-0.271 2.373l-0.004,0.083a1.192,1.192 0,0 0,0.003 0.145,1 1,0 1,0 1.997,-0.107l0.002,-0.029c0.039,-0.852 0.148,-1.675 0.312,-2.465ZM14.036,4.893a25.223,25.223 0,0 1,1.999 4.2h-4.071a18.207,18.207 0,0 1,2.072 -4.2ZM19.5,26.5a7,7 0,1 0,0 -14,7 7,0 0,0 0,14ZM22.957,17.457a1,1 0,0 0,-1.414 -1.414L19.5,18.086l-2.043,-2.043a1,1 0,0 0,-1.414 1.414l2.043,2.043 -2.043,2.043a1,1 0,0 0,1.414 1.414l2.043,-2.043 2.043,2.043a1,1 0,0 0,1.414 -1.414L20.914,19.5l2.043,-2.043Z"
+      android:fillColor="#000"
+      android:fillType="evenOdd"/>
+</vector>
diff --git a/app/src/main/res/values-ru/strings.xml b/app/src/main/res/values-ru/strings.xml
index d259336..9d19927 100644
--- a/app/src/main/res/values-ru/strings.xml
+++ b/app/src/main/res/values-ru/strings.xml
@@ -13,7 +13,7 @@
     <string name="MenuFileOpenFileLoaded">Файл загружен.</string>
     <string name="MenuFileOpenFileFailed">Не удалось открыть модель</string>
     <string name="MenuFileOpenFileFailedNullName">Не удалось определить имя файла.</string>
-    <string name="MenuFileOpenFileBigObject">Файл содержит более 100к треугольников. Нарезка может быть очень медленной.</string>
+    <string name="MenuFileOpenFileBigObject">Файл содержит более 500к треугольников. Нарезка может быть медленной.</string>
     <string name="MenuFileOpenFileLoading">Загрузка файла…</string>
     <string name="MenuFileDelete">Убрать модель</string>
     <string name="MenuFileCalibrations">Калибров.</string>
diff --git a/app/src/main/res/values/strings.xml b/app/src/main/res/values/strings.xml
index 5235175..c2072ea 100644
--- a/app/src/main/res/values/strings.xml
+++ b/app/src/main/res/values/strings.xml
@@ -14,7 +14,7 @@
     <string name="MenuFileOpenFileLoaded">File loaded.</string>
     <string name="MenuFileOpenFileFailed">Failed to open model</string>
     <string name="MenuFileOpenFileFailedNullName">Failed to resolve file name.</string>
-    <string name="MenuFileOpenFileBigObject">File has more than 100k triangles. Processing could be really slow.</string>
+    <string name="MenuFileOpenFileBigObject">File has more than 500k triangles. Processing could be slow.</string>
     <string name="MenuFileOpenFileLoading">Loading file…</string>
     <string name="MenuFileDelete">Remove model</string>
     <string name="MenuFileCalibrations">Calibrat.</string>