diff --git a/src/silx/gui/plot/test/test_plotwidget.py b/src/silx/gui/plot/test/test_plotwidget.py
index 0e273c11ef..e6c1c74520 100755
--- a/src/silx/gui/plot/test/test_plotwidget.py
+++ b/src/silx/gui/plot/test/test_plotwidget.py
@@ -121,7 +121,7 @@ def testResizeWidget(self):
         """Test resizing the widget and receiving limitsChanged events"""
         self.plot.resize(200, 200)
         self.qapp.processEvents()
-        self.qWait(100)
+        self.qWait(500)
 
         xlim = self.plot.getXAxis().getLimits()
         ylim = self.plot.getYAxis().getLimits()
@@ -133,19 +133,19 @@ def testResizeWidget(self):
         # Resize without aspect ratio
         self.plot.resize(200, 300)
         self.qapp.processEvents()
-        self.qWait(100)
+        self.qWait(500)
         self._checkLimits(expectedXLim=xlim, expectedYLim=ylim)
         self.assertEqual(listener.callCount(), 0)
 
         # Resize with aspect ratio
         self.plot.setKeepDataAspectRatio(True)
         self.qapp.processEvents()
-        self.qWait(1000)
+        self.qWait(500)
         listener.clear()  # Clean-up received signal
 
         self.plot.resize(200, 200)
         self.qapp.processEvents()
-        self.qWait(100)
+        self.qWait(500)
         self.assertNotEqual(listener.callCount(), 0)
 
     def testAddRemoveItemSignals(self):
diff --git a/src/silx/gui/plot/test/utils.py b/src/silx/gui/plot/test/utils.py
index d48a4670f2..0055928bd0 100644
--- a/src/silx/gui/plot/test/utils.py
+++ b/src/silx/gui/plot/test/utils.py
@@ -1,6 +1,6 @@
 # /*##########################################################################
 #
-# Copyright (c) 2016-2021 European Synchrotron Radiation Facility
+# Copyright (c) 2016-2024 European Synchrotron Radiation Facility
 #
 # Permission is hereby granted, free of charge, to any person obtaining a copy
 # of this software and associated documentation files (the "Software"), to deal
@@ -59,6 +59,8 @@ def setUp(self):
         self.plot.show()
         self.plotAlive = True
         self.qWaitForWindowExposed(self.plot)
+        self.plot.raise_()
+        self.qapp.processEvents()
         TestCaseQt.mouseClick(self, self.plot, button=qt.Qt.LeftButton, pos=(0, 0))
 
     def __onPlotDestroyed(self):
diff --git a/src/silx/gui/plot3d/test/test_scenewidgetpicking.py b/src/silx/gui/plot3d/test/test_scenewidgetpicking.py
index 1c32899286..b2d23897a8 100644
--- a/src/silx/gui/plot3d/test/test_scenewidgetpicking.py
+++ b/src/silx/gui/plot3d/test/test_scenewidgetpicking.py
@@ -1,6 +1,6 @@
 # /*##########################################################################
 #
-# Copyright (c) 2018-2019 European Synchrotron Radiation Facility
+# Copyright (c) 2018-2024 European Synchrotron Radiation Facility
 #
 # Permission is hereby granted, free of charge, to any person obtaining a copy
 # of this software and associated documentation files (the "Software"), to deal
@@ -45,9 +45,10 @@ class TestSceneWidgetPicking(TestCaseQt, ParametricTestCase):
     def setUp(self):
         super(TestSceneWidgetPicking, self).setUp()
         self.widget = SceneWidget()
-        self.widget.resize(300, 300)
         self.widget.show()
-        # self.qWaitForWindowExposed(self.widget)
+        self.widget.raise_()
+        self.qWaitForWindowExposed(self.widget)
+        self.qapp.processEvents()
 
     def tearDown(self):
         self.qapp.processEvents()