#########################################################
Preparation:
#########################################################
diff --git a/tlmisc/startupbg/tl-startup-bg b/tlmisc/startupbg/tl-startup-bg
index 280a59e99..3d94ccb3e 100755
--- a/tlmisc/startupbg/tl-startup-bg
+++ b/tlmisc/startupbg/tl-startup-bg
@@ -25,6 +25,7 @@ from thinlinc.Xlib import display, X
 from thinlinc.Xlib.ext import randr
 from thinlinc.Xlib.error import DisplayConnectionError
 from thinlinc.Xlib.protocol import request
+import cProfile
 
 def print_error(*args):
     prefix = "%s: error:" % os.path.basename(sys.argv[0])
@@ -302,7 +303,9 @@ class StartupBackground ():
 
         # Set the pixmap as background on the root window
         self.root.change_attributes(background_pixmap=pixmap)
+        self.display.flush()
         self.root.clear_area() # Redraw
+        self.display.sync()
 
     def loop(self):
         # Set up what events to listen for. We are interested in
@@ -335,7 +338,9 @@ class StartupBackground ():
                 return
 
             # Set backgrounds to fit new sizes of each monitor
-            self.set_root_background()
+            cProfile.runctx("self.set_root_background()", globals(), locals())
             self.last_resize = time.time()
 
 def main():
#########################################################
Measurement:
#########################################################
         91391 function calls (91379 primitive calls) in 12.183 seconds

   Ordered by: standard name

   ncalls  tottime  percall  cumtime  percall filename:lineno(function)
        1    0.002    0.002   12.183   12.183 <string>:1(<module>)
        1    0.000    0.000   11.879   11.879 display.py:170(flush)
        1    0.000    0.000    0.010    0.010 display.py:176(sync)
        1    0.000    0.000   11.879   11.879 display.py:252(flush)
        2    0.000    0.000    0.000    0.000 display.py:265(allocate_resource_id)
        4    0.000    0.000    0.000    0.000 display.py:313(get_resource_class)
        1    0.000    0.000    0.000    0.000 display.py:325(get_extension_major)
        1    0.000    0.000    0.000    0.000 display.py:345(check_for_error)
     1086    0.003    0.000    0.003    0.000 display.py:353(send_request)
        3   11.860    3.953   11.889    3.963 display.py:387(send_and_recv)
        4    0.000    0.000    0.000    0.000 display.py:49(__init__)
       15    0.000    0.000    0.000    0.000 display.py:60(__len__)
        6    0.000    0.000    0.000    0.000 display.py:63(__getitem__)
        3    0.000    0.000    0.000    0.000 display.py:677(parse_response)
        2    0.000    0.000    0.000    0.000 display.py:782(parse_request_response)
        2    0.000    0.000    0.000    0.000 display.py:813(parse_event_response)
        1    0.000    0.000    0.010    0.010 display.py:822(get_pointer_control)
        2    0.000    0.000    0.000    0.000 display.py:868(get_waiting_request)
        2    0.000    0.000    0.000    0.000 display.py:922(get_waiting_replyrequest)
     1080    0.003    0.000    0.083    0.000 drawable.py:196(put_image)
        1    0.000    0.000    0.000    0.000 drawable.py:350(change_attributes)
        1    0.000    0.000    0.000    0.000 drawable.py:41(create_pixmap)
        1    0.000    0.000    0.000    0.000 drawable.py:53(create_gc)
        1    0.000    0.000    0.000    0.000 drawable.py:632(clear_area)
     2228    0.000    0.000    0.000    0.000 lock.py:36(__noop)
        2    0.000    0.000    0.000    0.000 lock.py:43(allocate_lock)
        1    0.000    0.000    0.000    0.000 randr.py:1125(get_monitors)
        4    0.000    0.000    0.000    0.000 resource.py:25(__init__)
     1082    0.000    0.000    0.000    0.000 resource.py:30(__resource__)
     1086    0.000    0.000    0.000    0.000 rq.py:1069(<listcomp>)
      6/4    0.000    0.000    0.000    0.000 rq.py:1134(parse_binary)
       35    0.000    0.000    0.000    0.000 rq.py:1290(__getattr__)
        2    0.000    0.000    0.000    0.000 rq.py:1300(__init__)
     1084    0.003    0.000    0.081    0.000 rq.py:1344(__init__)
        2    0.000    0.000    0.011    0.005 rq.py:1357(__init__)
        2    0.000    0.000    0.011    0.005 rq.py:1370(reply)
        2    0.000    0.000    0.000    0.000 rq.py:1390(_parse_response)
        2    0.000    0.000    0.000    0.000 rq.py:1406(__init__)
     1086    0.000    0.000    0.000    0.000 rq.py:203(calc_length)
     2168    0.001    0.000    0.002    0.000 rq.py:297(check_value)
        2    0.000    0.000    0.000    0.000 rq.py:303(parse_value)
        2    0.000    0.000    0.000    0.000 rq.py:352(check_value)
     1080    0.000    0.000    0.000    0.000 rq.py:363(check_value)
     1080    0.003    0.000    0.003    0.000 rq.py:395(pack_value)
      3/1    0.000    0.000    0.000    0.000 rq.py:501(parse_binary_value)
        2    0.000    0.000    0.000    0.000 rq.py:741(pack_value)
     1086    0.054    0.000    0.074    0.000 rq.py:982(to_binary)
     1086    0.004    0.000    0.005    0.000 rq.py:993(<listcomp>)
        1    0.000    0.000    0.110    0.110 tl-startup-bg:111(set_image)
        1    0.049    0.049    0.049    0.049 tl-startup-bg:138(get_pixels)
        1    0.028    0.028    0.162    0.162 tl-startup-bg:183(put_image_surface)
        1    0.000    0.000    0.000    0.000 tl-startup-bg:235(get_total_monitor_size)
        1    0.004    0.004   12.181   12.181 tl-startup-bg:282(set_root_background)
        1    0.000    0.000    0.015    0.015 tl-startup-bg:81(set_solid_color)
        2    0.000    0.000    0.000    0.000 tl-startup-bg:93(scale_pattern)
        2    0.000    0.000    0.000    0.000 {built-in method _struct.calcsize}
     1089    0.001    0.000    0.001    0.000 {built-in method _struct.pack}
       12    0.000    0.000    0.000    0.000 {built-in method _struct.unpack}
        1    0.000    0.000   12.183   12.183 {built-in method builtins.exec}
     1082    0.000    0.000    0.000    0.000 {built-in method builtins.getattr}
     2172    0.000    0.000    0.000    0.000 {built-in method builtins.hasattr}
    48828    0.005    0.000    0.005    0.000 {built-in method builtins.isinstance}
4368/4360    0.001    0.000    0.001    0.000 {built-in method builtins.len}
     1083    0.000    0.000    0.000    0.000 {built-in method builtins.max}
     1080    0.001    0.000    0.001    0.000 {built-in method builtins.min}
        5    0.010    0.002    0.010    0.002 {built-in method select.select}
    12999    0.001    0.000    0.001    0.000 {method 'append' of 'list' objects}
        1    0.000    0.000    0.000    0.000 {method 'disable' of '_lsprof.Profiler' objects}
        3    0.125    0.042    0.125    0.042 {method 'fill' of 'cairo.Context' objects}
       12    0.000    0.000    0.000    0.000 {method 'get' of 'dict' objects}
        1    0.000    0.000    0.000    0.000 {method 'get_data' of 'cairo.ImageSurface' objects}
        2    0.000    0.000    0.000    0.000 {method 'get_height' of 'cairo.ImageSurface' objects}
        2    0.000    0.000    0.000    0.000 {method 'get_source' of 'cairo.Context' objects}
        1    0.000    0.000    0.000    0.000 {method 'get_stride' of 'cairo.ImageSurface' objects}
        4    0.000    0.000    0.000    0.000 {method 'get_width' of 'cairo.ImageSurface' objects}
     1086    0.001    0.000    0.001    0.000 {method 'intersection' of 'set' objects}
     1086    0.002    0.000    0.002    0.000 {method 'join' of 'bytes' objects}
        3    0.000    0.000    0.000    0.000 {method 'rectangle' of 'cairo.Context' objects}
        3    0.000    0.000    0.000    0.000 {method 'recv' of '_socket.socket' objects}
        3    0.000    0.000    0.000    0.000 {method 'restore' of 'cairo.Context' objects}
        3    0.000    0.000    0.000    0.000 {method 'save' of 'cairo.Context' objects}
        3    0.019    0.006    0.019    0.006 {method 'send' of '_socket.socket' objects}
        2    0.000    0.000    0.000    0.000 {method 'set_matrix' of 'cairo.Pattern' objects}
        2    0.000    0.000    0.000    0.000 {method 'set_source' of 'cairo.Context' objects}
        1    0.000    0.000    0.000    0.000 {method 'set_source_rgba' of 'cairo.Context' objects}
        1    0.000    0.000    0.000    0.000 {method 'set_source_surface' of 'cairo.Context' objects}
        2    0.000    0.000    0.000    0.000 {method 'translate' of 'cairo.Context' objects}
     1086    0.000    0.000    0.000    0.000 {method 'update' of 'dict' objects}