diff --git a/src/app/crash/read_document.cpp b/src/app/crash/read_document.cpp
index 6dfbd957d..199e3b79e 100644
--- a/src/app/crash/read_document.cpp
+++ b/src/app/crash/read_document.cpp
@@ -91,7 +91,12 @@ public:
       if (!id || !ver)
         continue;               // Error converting strings to ID/ver
 
-      if (!check_magic_number(base::join_path(m_dir, fn))) {
+      // Checking for the magic number of each file takes a long time,
+      // we can guess that all files are valid when there is no
+      // m_taskToken, i.e. when we have to just show the description
+      // of the doc in the list of backups.
+      if (m_taskToken &&
+          !check_magic_number(base::join_path(m_dir, fn))) {
         RECO_TRACE("RECO: Ignoring invalid file %s (no magic number)\n", fn.c_str());
         continue;
       }
diff --git a/src/app/crash/session.cpp b/src/app/crash/session.cpp
index 616bf3d7e..ae8afb8b7 100644
--- a/src/app/crash/session.cpp
+++ b/src/app/crash/session.cpp
@@ -44,22 +44,24 @@ static const char* kOpenFilename = "open"; // File that indicates if the documen
 Session::Backup::Backup(const std::string& dir)
   : m_dir(dir)
 {
-  DocumentInfo info;
-  read_document_info(dir, info);
-
-  m_fn = info.filename;
-  m_desc =
-    fmt::format("{} Sprite {}x{}, {} {}",
-                info.mode == ColorMode::RGB ? "RGB":
-                info.mode == ColorMode::GRAYSCALE ? "Grayscale":
-                info.mode == ColorMode::INDEXED ? "Indexed":
-                info.mode == ColorMode::BITMAP ? "Bitmap": "Unknown",
-                info.width, info.height, info.frames,
-                info.frames == 1 ? "frame": "frames");
 }
 
 std::string Session::Backup::description(const bool withFullPath) const
 {
+  // Lazy initialize description and filename.
+  if (m_desc.empty()) {
+    DocumentInfo info;
+    read_document_info(m_dir, info);
+    m_fn = info.filename;
+    m_desc =
+      fmt::format("{} Sprite {}x{}, {} {}",
+                  info.mode == ColorMode::RGB ? "RGB":
+                  info.mode == ColorMode::GRAYSCALE ? "Grayscale":
+                  info.mode == ColorMode::INDEXED ? "Indexed":
+                  info.mode == ColorMode::BITMAP ? "Bitmap": "Unknown",
+                  info.width, info.height, info.frames,
+                  info.frames == 1 ? "frame": "frames");
+  }
   return fmt::format("{}: {}",
                      m_desc,
                      withFullPath ? m_fn:
diff --git a/src/app/crash/session.h b/src/app/crash/session.h
index 4ae1280d9..07a3c9a03 100644
--- a/src/app/crash/session.h
+++ b/src/app/crash/session.h
@@ -35,8 +35,8 @@ namespace crash {
       std::string description(const bool withFullPath) const;
     private:
       std::string m_dir;
-      std::string m_desc;
-      std::string m_fn;
+      mutable std::string m_desc;
+      mutable std::string m_fn;
     };
     using BackupPtr = std::shared_ptr<Backup>;
     using Backups = std::vector<BackupPtr>;
diff --git a/src/app/ui/data_recovery_view.cpp b/src/app/ui/data_recovery_view.cpp
index 56dd4c8f3..d85d5b1a0 100644
--- a/src/app/ui/data_recovery_view.cpp
+++ b/src/app/ui/data_recovery_view.cpp
@@ -58,7 +58,6 @@ public:
     : m_session(session)
     , m_backup(backup)
     , m_task(nullptr) {
-    updateText();
   }
 
   crash::Session* session() const { return m_session; }
@@ -150,6 +149,15 @@ public:
   }
 
 private:
+  void onPaint(PaintEvent& ev) override {
+    // The text is lazily initialized. So we read the backup data only
+    // when we have to show its information.
+    if (text().empty()) {
+      updateText();
+    }
+    ListItem::onPaint(ev);
+  }
+
   void onSizeHint(SizeHintEvent& ev) override {
     ListItem::onSizeHint(ev);
     gfx::Size sz = ev.sizeHint();