diff --git a/install.cpp b/install.cpp
index 02c845c..9227d58 100644
--- a/install.cpp
+++ b/install.cpp
@@ -30,6 +30,8 @@
 #include <string>
 #include <vector>
 
+#include <android-base/file.h>
+#include <android-base/logging.h>
 #include <android-base/parseint.h>
 #include <android-base/stringprintf.h>
 #include <android-base/strings.h>
@@ -54,6 +56,7 @@
 static constexpr const char* AB_OTA_PAYLOAD = "payload.bin";
 #define PUBLIC_KEYS_FILE "/res/keys"
 static constexpr const char* METADATA_PATH = "META-INF/com/android/metadata";
+static constexpr const char* UNCRYPT_STATUS = "/cache/recovery/uncrypt_status";
 
 // Default allocation of progress bar segments to operations
 static const int VERIFICATION_PROGRESS_TIME = 60;
@@ -539,6 +542,16 @@
             fprintf(install_log, "%s\n", s.c_str());
         }
 
+        if (ensure_path_mounted(UNCRYPT_STATUS) != 0) {
+            LOG(WARNING) << "Can't mount " << UNCRYPT_STATUS;
+        } else {
+            std::string uncrypt_status;
+            if (!android::base::ReadFileToString(UNCRYPT_STATUS, &uncrypt_status)) {
+                PLOG(WARNING) << "failed to read uncrypt status";
+            } else {
+                fprintf(install_log, "%s\n", android::base::Trim(uncrypt_status).c_str());
+            }
+        }
         fclose(install_log);
     }
     return result;
diff --git a/uncrypt/uncrypt.cpp b/uncrypt/uncrypt.cpp
index 5e804bc..c73107c 100644
--- a/uncrypt/uncrypt.cpp
+++ b/uncrypt/uncrypt.cpp
@@ -134,6 +134,7 @@
 // devices, on which /cache partitions always exist.
 static const std::string CACHE_BLOCK_MAP = "/cache/recovery/block.map";
 static const std::string UNCRYPT_PATH_FILE = "/cache/recovery/uncrypt_file";
+static const std::string UNCRYPT_STATUS = "/cache/recovery/uncrypt_status";
 static const std::string UNCRYPT_SOCKET = "uncrypt";
 
 static struct fstab* fstab = nullptr;
@@ -466,12 +467,32 @@
         input_path = package.c_str();
     }
     CHECK(map_file != nullptr);
+
+#define UNCRYPT_TIME_HOLDER 0x7FFFFFFF
+    // Intialize the uncrypt time cost to a huge number so that we can tell from
+    // the statistics if an uncrypt fails to finish.
+    if (!android::base::WriteStringToFile(android::base::StringPrintf(
+            "uncrypt_time: %d\n", UNCRYPT_TIME_HOLDER), UNCRYPT_STATUS)) {
+        PLOG(WARNING) << "failed to write to " << UNCRYPT_STATUS;
+    }
+
+    auto start = std::chrono::system_clock::now();
     int status = uncrypt(input_path, map_file, socket);
     if (status != 0) {
         write_status_to_socket(-1, socket);
         return false;
     }
+
+    std::chrono::duration<double> duration = std::chrono::system_clock::now() - start;
+    int count = static_cast<int>(duration.count());
+    // Overwrite the uncrypt_time if uncrypt finishes successfully.
+    if (!android::base::WriteStringToFile(
+            android::base::StringPrintf("uncrypt_time: %d\n", count), UNCRYPT_STATUS)) {
+        PLOG(WARNING) << "failed to write to " << UNCRYPT_STATUS;
+    }
+
     write_status_to_socket(100, socket);
+
     return true;
 }
 
diff --git a/wear_ui.cpp b/wear_ui.cpp
index 3550992..bfa7097 100644
--- a/wear_ui.cpp
+++ b/wear_ui.cpp
@@ -184,55 +184,10 @@
     }
 }
 
-// Keeps the progress bar updated, even when the process is otherwise busy.
-void* WearRecoveryUI::progress_thread(void *cookie) {
-    self->progress_loop();
-    return NULL;
-}
-
-void WearRecoveryUI::progress_loop() {
-    double interval = 1.0 / animation_fps;
-    for (;;) {
-        double start = now();
-        pthread_mutex_lock(&updateMutex);
-        bool redraw = false;
-
-        if ((currentIcon == INSTALLING_UPDATE || currentIcon == ERASING)
-                                                            && !show_text) {
-            if (!intro_done) {
-                if (current_frame >= intro_frames - 1) {
-                    intro_done = true;
-                    current_frame = 0;
-                } else {
-                    current_frame++;
-                }
-            } else {
-                current_frame = (current_frame + 1) % loop_frames;
-            }
-            redraw = true;
-        }
-
-        // move the progress bar forward on timed intervals, if configured
-        int duration = progressScopeDuration;
-        if (progressBarType == DETERMINATE && duration > 0) {
-            double elapsed = now() - progressScopeTime;
-            float p = 1.0 * elapsed / duration;
-            if (p > 1.0) p = 1.0;
-            if (p > progress) {
-                progress = p;
-                redraw = true;
-            }
-        }
-
-        if (redraw) update_screen_locked();
-
-        pthread_mutex_unlock(&updateMutex);
-        double end = now();
-        // minimum of 20ms delay between frames
-        double delay = interval - (end-start);
-        if (delay < 0.02) delay = 0.02;
-        usleep((long)(delay * 1000000));
-    }
+// TODO merge drawing routines with screen_ui
+void WearRecoveryUI::update_progress_locked() {
+    draw_screen_locked();
+    gr_flip();
 }
 
 void WearRecoveryUI::InitTextParams() {
@@ -253,9 +208,6 @@
     backgroundIcon[ERASING] = backgroundIcon[INSTALLING_UPDATE];
     LoadBitmap("icon_error", &backgroundIcon[ERROR]);
     backgroundIcon[NO_COMMAND] = backgroundIcon[ERROR];
-
-    pthread_create(&progress_t, NULL, progress_thread, NULL);
-
 }
 
 void WearRecoveryUI::SetStage(int current, int max)
diff --git a/wear_ui.h b/wear_ui.h
index dadf324..9351d41 100644
--- a/wear_ui.h
+++ b/wear_ui.h
@@ -54,6 +54,8 @@
 
     void InitTextParams() override;
 
+    void update_progress_locked() override;
+
     void PrintV(const char*, bool, va_list) override;
 
   private:
@@ -74,8 +76,6 @@
     void draw_screen_locked() override;
     void draw_progress_locked();
 
-    static void* progress_thread(void* cookie);
-    void progress_loop();
     void PutChar(char);
     void ClearText();
 };