diff --git a/src/importer/importer.py b/src/importer/importer.py
index de72958..2371c7b 100644
--- a/src/importer/importer.py
+++ b/src/importer/importer.py
@@ -1,6 +1,5 @@
 import logging
 from pathlib import Path
-from threading import Lock, Thread
 
 import requests
 from gi.repository import Adw, Gio, Gtk
@@ -13,53 +12,70 @@ from .steamgriddb import SGDBAuthError, SGDBHelper
 class Importer:
     """A class in charge of scanning sources for games"""
 
-    # Dialog widget
     progressbar = None
     import_statuspage = None
     import_dialog = None
 
-    # Caller-set values
     win = None
     sources = None
 
-    # Internal values
+    n_games_added = 0
+    n_source_tasks_created = 0
+    n_source_tasks_done = 0
+    n_sgdb_tasks_created = 0
+    n_sgdb_tasks_done = 0
+    sgdb_cancellable = None
     sgdb_error = None
-    sgdb_error_lock = None
-    source_threads = None
-    sgdb_threads = None
-    progress_lock = None
-    games_lock = None
-    sgdb_threads_lock = None
-    counts = None
-    games = None
 
     def __init__(self, win):
-        self.games = set()
-        self.sources = set()
-        self.counts = {}
-        self.source_threads = []
-        self.sgdb_threads = []
-        self.games_lock = Lock()
-        self.progress_lock = Lock()
-        self.sgdb_threads_lock = Lock()
-        self.sgdb_error_lock = Lock()
         self.win = win
+        self.sources = set()
+
+    @property
+    def n_tasks_created(self):
+        return self.n_source_tasks_created + self.n_sgdb_tasks_created
+
+    @property
+    def n_tasks_done(self):
+        return self.n_source_tasks_done + self.n_sgdb_tasks_done
 
     @property
     def progress(self):
-        # Compute overall values
-        overall = {"games": 0, "covers": 0, "total": 0}
-        with self.progress_lock:
-            for source in self.sources:
-                for key in overall:
-                    overall[key] = self.counts[source.id][key]
-        # Compute progress
         try:
-            progress = 1 - (overall["games"] + overall["covers"]) / overall["total"] * 2
+            progress = 1 - self.n_tasks_created / self.n_tasks_done
         except ZeroDivisionError:
             progress = 1
         return progress
 
+    @property
+    def finished(self):
+        return self.n_sgdb_tasks_created == self.n_tasks_done
+
+    def add_source(self, source):
+        self.sources.add(source)
+
+    def run(self):
+        """Use several Gio.Task to import games from added sources"""
+
+        self.create_dialog()
+
+        # Single SGDB cancellable shared by all its tasks
+        # (If SGDB auth is bad, cancel all SGDB tasks)
+        self.sgdb_cancellable = Gio.Cancellable()
+
+        # Create a task for each source
+        tasks = set()
+        for source in self.sources:
+            self.n_source_tasks_created += 1
+            logging.debug("Importing games from source %s", source.id)
+            task = Gio.Task(None, None, self.source_task_callback, (source,))
+            task.set_task_data((source,))
+            tasks.add(task)
+
+        # Start all tasks
+        for task in tasks:
+            task.run_in_thread(self.source_task_thread_func)
+
     def create_dialog(self):
         """Create the import dialog"""
         self.progressbar = Gtk.ProgressBar(margin_start=12, margin_end=12)
@@ -77,40 +93,143 @@ class Importer:
         )
         self.import_dialog.present()
 
-    def create_sgdb_error_dialog(self):
-        create_dialog(
-            self.win,
-            _("Couldn't Connect to SteamGridDB"),
-            str(self.sgdb_error),
-            "open_preferences",
-            _("Preferences"),
-        ).connect("response", self.on_dialog_response, "sgdb")
+    def update_progressbar(self):
+        self.progressbar.set_fraction(self.progress)
+
+    def source_task_thread_func(self, _task, _obj, data, _cancellable):
+        """Source import task code"""
+
+        source, *_rest = data
+
+        # Early exit if not installed
+        if not source.is_installed:
+            logging.info("Source %s skipped, not installed", source.id)
+            return
+
+        # Initialize source iteration
+        iterator = iter(source)
+
+        # Get games from source
+        while True:
+            # Handle exceptions raised when iterating
+            try:
+                game = next(iterator)
+            except StopIteration:
+                break
+            except Exception as exception:  # pylint: disable=broad-exception-caught
+                logging.exception(
+                    msg=f"Exception in source {source.id}",
+                    exc_info=exception,
+                )
+                continue
+
+            # TODO make sources return games AND avoid duplicates
+            game_id = game.game_id
+            if game.game_id in self.win.games and not self.win.games[game_id].removed:
+                continue
+            game.save()
+            self.n_games_added += 1
+
+            # Start sgdb lookup for game
+            # HACK move to its own manager
+            task = Gio.Task(
+                None, self.sgdb_cancellable, self.sgdb_task_callback, (game,)
+            )
+            task.set_task_data((game,))
+            task.run_in_thread(self.sgdb_task_thread_func)
+
+    def source_task_callback(self, _obj, _result, data):
+        """Source import callback"""
+        _source, *_rest = data
+        self.n_source_tasks_done += 1
+        self.update_progressbar()
+        if self.finished:
+            self.import_callback()
+
+    def sgdb_task_thread_func(self, _task, _obj, data, cancellable):
+        """SGDB query code"""
+
+        game, *_rest = data
+
+        use_sgdb = self.win.schema.get_boolean("sgdb")
+        if not use_sgdb or game.blacklisted:
+            return
+
+        # Check if we should query SGDB
+        prefer_sgdb = self.win.schema.get_boolean("sgdb-prefer")
+        prefer_animated = self.win.schema.get_boolean("sgdb-animated")
+        image_trunk = self.win.covers_dir / game.game_id
+        still = image_trunk.with_suffix(".tiff")
+        animated = image_trunk.with_suffix(".gif")
+
+        # Breaking down the condition
+        is_missing = not still.is_file() and not animated.is_file()
+        is_not_best = not animated.is_file() and prefer_animated
+        if not (is_missing or is_not_best or prefer_sgdb):
+            return
+
+        game.set_loading(1)
+
+        # SGDB request
+        sgdb = SGDBHelper(self.win)
+        try:
+            sgdb_id = sgdb.get_game_id(game)
+            uri = sgdb.get_game_image_uri(sgdb_id, animated=prefer_animated)
+            response = requests.get(uri, timeout=5)
+        except SGDBAuthError as error:
+            # On auth error, cancel all present and future SGDB tasks for this import
+            self.sgdb_error = error
+            logging.error("SGDB Auth error occured", exc_info=error)
+            cancellable.cancel()
+            return
+        except Exception as error:  # pylint: disable=broad-exception-caught
+            logging.warning("Non auth error in SGDB query", exc_info=error)
+            return
+
+        # Image saving
+        tmp_file = Gio.File.new_tmp()[0]
+        tmp_file_path = tmp_file.get_path()
+        Path(tmp_file_path).write_bytes(response.content)
+        save_cover(self.win, game.game_id, resize_cover(self.win, tmp_file_path))
+
+    def sgdb_task_callback(self, _obj, _result, data):
+        """SGDB query callback"""
+        game, *_rest = data
+        game.set_loading(0)
+        self.n_sgdb_tasks_done += 1
+        self.update_progressbar()
+        if self.finished:
+            self.import_callback()
+
+    def import_callback(self):
+        """Callback called when importing has finished"""
+        self.import_dialog.close()
+        self.create_import_done_dialog()
 
     def create_import_done_dialog(self):
-        games_no = len(self.games)
-        if games_no == 0:
+        if self.n_games_added == 0:
             create_dialog(
                 self.win,
                 _("No Games Found"),
                 _("No new games were found on your system."),
                 "open_preferences",
                 _("Preferences"),
-            ).connect("response", self.on_dialog_response)
-        elif games_no == 1:
+            ).connect("response", self.dialog_response_callback)
+        elif self.n_games_added == 1:
             create_dialog(
                 self.win,
                 _("Game Imported"),
                 _("Successfully imported 1 game."),
-            ).connect("response", self.on_dialog_response)
-        elif games_no > 1:
+            ).connect("response", self.dialog_response_callback)
+        elif self.n_games_added > 1:
             create_dialog(
                 self.win,
                 _("Games Imported"),
                 # The variable is the number of games
-                _("Successfully imported {} games.").format(games_no),
-            ).connect("response", self.on_dialog_response)
+                _("Successfully imported {} games.").format(self.n_games_added),
+            ).connect("response", self.dialog_response_callback)
 
-    def on_dialog_response(self, _widget, response, *args):
+    def dialog_response_callback(self, _widget, response, *args):
         if response == "open_preferences":
             page, expander_row, *_rest = args
             self.win.get_application().on_preferences_action(
@@ -123,176 +242,11 @@ class Importer:
         # TODO additional steam libraries tip
         # (should be handled by the source somehow)
 
-    def update_progressbar(self):
-        self.progressbar.set_fraction(self.progress)
-
-    def add_source(self, source):
-        self.sources.add(source)
-        self.counts[source.id] = {"games": 0, "covers": 0, "total": 0}
-
-    def run_in_thread(self):
-        thread = ImporterThread(self, self.win)
-        thread.start()
-
-
-class ImporterThread(Thread):
-    """Thread in charge of the import process"""
-
-    importer = None
-    win = None
-
-    def __init__(self, importer, win, *args, **kwargs):
-        super().__init__(*args, **kwargs)
-        self.importer = importer
-        self.win = win
-
-    def run(self):
-        """Thread entry point"""
-
-        self.importer.create_dialog()
-
-        # Scan sources in threads
-        for source in self.importer.sources:
-            print(f"{source.full_name}, installed: {source.is_installed}")
-            if not source.is_installed:
-                continue
-            thread = SourceThread(source, self.win, self.importer)
-            self.importer.source_threads.append(thread)
-            thread.start()
-
-        for thread in self.importer.source_threads:
-            thread.join()
-
-        # Save games
-        for game in self.importer.games:
-            if (
-                game.game_id in self.win.games
-                and not self.win.games[game.game_id].removed
-            ):
-                continue
-            game.save()
-
-        # Wait for SGDB query threads to finish
-        for thread in self.importer.sgdb_threads:
-            thread.join()
-
-        self.importer.import_dialog.close()
-        self.importer.create_import_done_dialog()
-
-
-class SourceThread(Thread):
-    """Thread in charge of scanning a source for games"""
-
-    source = None
-    win = None
-    importer = None
-
-    def __init__(self, source, win, importer, *args, **kwargs):
-        super().__init__(*args, **kwargs)
-        self.source = source
-        self.win = win
-        self.importer = importer
-
-    def run(self):
-        """Thread entry point"""
-
-        # Initialize source iteration
-        iterator = iter(self.source)
-        with self.importer.progress_lock:
-            self.importer.counts[self.source.id]["total"] = len(iterator)
-
-        # Get games from source
-        while True:
-            # Handle exceptions raised while iteration the source
-            try:
-                game = next(iterator)
-            except StopIteration:
-                break
-            except Exception as exception:  # pylint: disable=broad-exception-caught
-                logging.exception(
-                    msg=f"Exception in source {self.source.id}",
-                    exc_info=exception,
-                )
-                continue
-
-            # Add game to importer
-            with self.importer.games_lock:
-                self.importer.games.add(game)
-            with self.importer.progress_lock:
-                self.importer.counts[self.source.id]["games"] += 1
-            self.importer.update_progressbar()
-
-            # Start sgdb lookup for game in another thread
-            # HACK move to a game manager
-            sgdb_thread = SGDBThread(game, self.win, self.importer)
-            with self.importer.sgdb_threads_lock:
-                self.importer.sgdb_threads.append(sgdb_thread)
-            sgdb_thread.start()
-
-
-class SGDBThread(Thread):
-    """Thread in charge of querying SGDB for a game image"""
-
-    game = None
-    win = None
-    importer = None
-
-    def __init__(self, game, win, importer, *args, **kwargs):
-        super().__init__(*args, **kwargs)
-        self.game = game
-        self.win = win
-        self.importer = importer
-
-    def conditionnaly_fetch_cover(self):
-        use_sgdb = self.win.schema.get_boolean("sgdb")
-        if (
-            not use_sgdb
-            or self.game.blacklisted
-            or self.importer.sgdb_error is not None
-        ):
-            return
-
-        # Check if we should query SGDB
-        prefer_sgdb = self.win.schema.get_boolean("sgdb-prefer")
-        prefer_animated = self.win.schema.get_boolean("sgdb-animated")
-        image_trunk = self.win.covers_dir / self.game.game_id
-        still = image_trunk.with_suffix(".tiff")
-        animated = image_trunk.with_suffix(".gif")
-
-        # Breaking down the condition
-        is_missing = not still.is_file() and not animated.is_file()
-        is_not_best = not animated.is_file() and prefer_animated
-        if not (is_missing or is_not_best or prefer_sgdb):
-            return
-
-        self.game.set_loading(1)
-
-        # SGDB request
-        sgdb = SGDBHelper(self.win)
-        try:
-            sgdb_id = sgdb.get_game_id(self.game)
-            uri = sgdb.get_game_image_uri(sgdb_id, animated=prefer_animated)
-            response = requests.get(uri, timeout=5)
-        except SGDBAuthError as error:
-            with self.importer.sgdb_error_lock:
-                if self.importer.sgdb_error is None:
-                    self.importer.sgdb_error = error
-            logging.error("SGDB Auth error occured")
-            return
-        except Exception as error:  # pylint: disable=broad-exception-caught
-            logging.warning("Non auth error in SGDB query", exc_info=error)
-            return
-
-        # Image saving
-        tmp_file = Gio.File.new_tmp()[0]
-        tmp_file_path = tmp_file.get_path()
-        Path(tmp_file_path).write_bytes(response.content)
-        save_cover(self.win, self.game.game_id, resize_cover(self.win, tmp_file_path))
-
-        self.game.set_loading(0)
-
-    def run(self):
-        """Thread entry point"""
-        self.conditionnaly_fetch_cover()
-        with self.importer.progress_lock:
-            self.importer.counts[self.game.source.id]["covers"] += 1
+    def create_sgdb_error_dialog(self):
+        create_dialog(
+            self.win,
+            _("Couldn't Connect to SteamGridDB"),
+            str(self.sgdb_error),
+            "open_preferences",
+            _("Preferences"),
+        ).connect("response", self.dialog_response_callback, "sgdb")
diff --git a/src/main.py b/src/main.py
index 22858b6..c45fbda 100644
--- a/src/main.py
+++ b/src/main.py
@@ -18,6 +18,8 @@
 # SPDX-License-Identifier: GPL-3.0-or-later
 
 import sys
+import os
+import logging
 
 import gi
 
@@ -151,7 +153,7 @@ class CartridgesApplication(Adw.Application):
         if self.win.schema.get_boolean("lutris"):
             importer.add_source(LutrisNativeSource(self.win))
             importer.add_source(LutrisFlatpakSource(self.win))
-        importer.run_in_thread()
+        importer.run()
 
     def on_remove_game_action(self, *_args):
         self.win.active_game.remove_game()
@@ -198,5 +200,7 @@ class CartridgesApplication(Adw.Application):
 
 
 def main(version):  # pylint: disable=unused-argument
+    log_level = os.environ.get("LOGLEVEL", "ERROR").upper()
+    logging.basicConfig(level="DEBUG")  # TODO remove debug
     app = CartridgesApplication()
     return app.run(sys.argv)