def frame_change_handler_stop_at_frame_end(scene):
    print(" - Frame change handler stop at frame end invoked")
    if scene.frame_current == scene.frame_end:
        bpy.ops.screen.animation_cancel();

def _run(arg):
    bpy.app.handlers.frame_change_post.append(frame_change_handler_stop_at_frame_end)

    print(" -  Perform dry-run")
    scene.frame_set(scene.frame_start)
    bpy.ops.screen.animation_play()
    while scene.frame_current != scene.frame_end:
        time.sleep(1)

def _run2(args):
    """
    This implementation isn't working as drawing isn't triggered by time.sleep.
    time.sleep doesn't continue with the main loop of blender which will not
    perform any drawing or updating until this function is finished.
    """
    import bpy

    screen = bpy.context.window_manager.windows[0].screen
    scene = bpy.context.scene

    print(" - Setup scene.")

    # Set playback mode to draw all frames.
    scene.sync_mode = 'NONE'

    # Set rendered shading mode to all viewports.
    for area in screen.areas:
        if area.type == 'VIEW_3D':
            space = area.spaces[0]
            space.shading.type = 'RENDERED'
            space.overlay.show_overlays = False

    # Wait for shader compilation to be finished.
    print(" - Wait for shader compilation.")
    if hasattr(bpy.app, 'is_job_running'):
        # Sleep one frame to start draw manager and trigger shading compilation
        time.sleep(0)
        while bpy.app.is_job_running("SHADER_COMPILATION"):
            time.sleep(1)
    else:
        time.sleep(SHADER_FALLBACK_SECONDS)

    # Dry-run one cycle.
    print(" -  Perform dry-run")
    scene.frame_set(scene.frame_start)
    bpy.ops.screen.animation_play()
    while scene.frame_current != scene.frame_end:
        time.sleep(0)
    bpy.ops.screen.animation_cancel()
    
    print(" -  Start playback")
    current_iter = 0
    scene.frame_set(scene.frame_start)
    start_time = time.perf_counter()
    bpy.ops.screen.animation_play()
    while current_iter < RECORD_PLAYBACK_ITER:
        if scene.frame_current == scene.frame_end:
            current_iter += 1
            print(f" - Playback iteration {current_iter}")
        time.sleep(0)
    end_time = time.perf_counter()
    bpy.ops.screen.animation_play()

    print(" - Playback stopped")

    num_frames = RECORD_PLAYBACK_ITER * (scene.frame_end + 1 - scene.frame_start)
    frame_time = (end_time - start_time) / num_frames
    fps = 1.0 / frame_time
    return {"time": frame_time, "fps": fps}