diff --git a/pyqtgraph/__init__.py b/pyqtgraph/__init__.py
index d3aefa83..ed9e3357 100644
--- a/pyqtgraph/__init__.py
+++ b/pyqtgraph/__init__.py
@@ -54,6 +54,7 @@ CONFIG_OPTIONS = {
     'editorCommand': None,  ## command used to invoke code editor from ConsoleWidgets
     'useWeave': True,       ## Use weave to speed up some operations, if it is available
     'weaveDebug': False,    ## Print full error message if weave compile fails
+    'enableExperimental': False, ## Enable experimental features (the curious can search for this key in the code)
 } 
 
 
diff --git a/pyqtgraph/graphicsItems/PlotCurveItem.py b/pyqtgraph/graphicsItems/PlotCurveItem.py
index 35a38ae7..c5a8ec3f 100644
--- a/pyqtgraph/graphicsItems/PlotCurveItem.py
+++ b/pyqtgraph/graphicsItems/PlotCurveItem.py
@@ -1,4 +1,10 @@
 from pyqtgraph.Qt import QtGui, QtCore
+try:
+    from pyqtgraph.Qt import QtOpenGL
+    HAVE_OPENGL = True
+except:
+    HAVE_OPENGL = False
+    
 from scipy.fftpack import fft
 import numpy as np
 import scipy.stats
@@ -370,12 +376,11 @@ class PlotCurveItem(GraphicsObject):
         prof = debug.Profiler('PlotCurveItem.paint '+str(id(self)), disabled=True)
         if self.xData is None:
             return
-        #if self.opts['spectrumMode']:
-            #if self.specPath is None:
-                
-                #self.specPath = self.generatePath(*self.getData())
-            #path = self.specPath
-        #else:
+        
+        if HAVE_OPENGL and pg.getConfigOption('enableExperimental') and isinstance(widget, QtOpenGL.QGLWidget):
+            self.paintGL(p, opt, widget)
+            return
+        
         x = None
         y = None
         if self.path is None:
@@ -385,7 +390,6 @@ class PlotCurveItem(GraphicsObject):
             self.path = self.generatePath(x,y)
             self.fillPath = None
             
-            
         path = self.path
         prof.mark('generate path')
         
@@ -440,6 +444,65 @@ class PlotCurveItem(GraphicsObject):
         #p.setPen(QtGui.QPen(QtGui.QColor(255,0,0)))
         #p.drawRect(self.boundingRect())
         
+    def paintGL(self, p, opt, widget):
+        p.beginNativePainting()
+        import OpenGL.GL as gl
+        
+        ## set clipping viewport
+        view = self.getViewBox()
+        if view is not None:
+            rect = view.mapRectToItem(self, view.boundingRect())
+            #gl.glViewport(int(rect.x()), int(rect.y()), int(rect.width()), int(rect.height()))
+            
+            #gl.glTranslate(-rect.x(), -rect.y(), 0)
+            
+            gl.glEnable(gl.GL_STENCIL_TEST)
+            gl.glColorMask(gl.GL_FALSE, gl.GL_FALSE, gl.GL_FALSE, gl.GL_FALSE) # disable drawing to frame buffer
+            gl.glDepthMask(gl.GL_FALSE)  # disable drawing to depth buffer
+            gl.glStencilFunc(gl.GL_NEVER, 1, 0xFF)  
+            gl.glStencilOp(gl.GL_REPLACE, gl.GL_KEEP, gl.GL_KEEP)  
+            
+            ## draw stencil pattern
+            gl.glStencilMask(0xFF);
+            gl.glClear(gl.GL_STENCIL_BUFFER_BIT)
+            gl.glBegin(gl.GL_TRIANGLES)
+            gl.glVertex2f(rect.x(), rect.y())
+            gl.glVertex2f(rect.x()+rect.width(), rect.y())
+            gl.glVertex2f(rect.x(), rect.y()+rect.height())
+            gl.glVertex2f(rect.x()+rect.width(), rect.y()+rect.height())
+            gl.glVertex2f(rect.x()+rect.width(), rect.y())
+            gl.glVertex2f(rect.x(), rect.y()+rect.height())
+            gl.glEnd()
+                       
+            gl.glColorMask(gl.GL_TRUE, gl.GL_TRUE, gl.GL_TRUE, gl.GL_TRUE)
+            gl.glDepthMask(gl.GL_TRUE)
+            gl.glStencilMask(0x00)
+            gl.glStencilFunc(gl.GL_EQUAL, 1, 0xFF)
+            
+        try:
+            x, y = self.getData()
+            pos = np.empty((len(x), 2))
+            pos[:,0] = x
+            pos[:,1] = y
+            gl.glEnableClientState(gl.GL_VERTEX_ARRAY)
+            try:
+                gl.glVertexPointerf(pos)
+                pen = fn.mkPen(self.opts['pen'])
+                color = pen.color()
+                gl.glColor4f(color.red()/255., color.green()/255., color.blue()/255., color.alpha()/255.)
+                width = pen.width()
+                if pen.isCosmetic() and width < 1:
+                    width = 1
+                gl.glPointSize(width)
+                gl.glEnable(gl.GL_LINE_SMOOTH)
+                gl.glEnable(gl.GL_BLEND)
+                gl.glBlendFunc(gl.GL_SRC_ALPHA, gl.GL_ONE_MINUS_SRC_ALPHA)
+                gl.glHint(gl.GL_LINE_SMOOTH_HINT, gl.GL_NICEST);
+                gl.glDrawArrays(gl.GL_LINE_STRIP, 0, pos.size / pos.shape[-1])
+            finally:
+                gl.glDisableClientState(gl.GL_VERTEX_ARRAY)
+        finally:
+            p.endNativePainting()
         
     def clear(self):
         self.xData = None  ## raw values
diff --git a/pyqtgraph/graphicsItems/ScatterPlotItem.py b/pyqtgraph/graphicsItems/ScatterPlotItem.py
index a69131ef..84c05478 100644
--- a/pyqtgraph/graphicsItems/ScatterPlotItem.py
+++ b/pyqtgraph/graphicsItems/ScatterPlotItem.py
@@ -683,6 +683,9 @@ class ScatterPlotItem(GraphicsObject):
             rec = self.data[i]
             pos = QtCore.QPointF(pts[0,i], pts[1,i])
             x,y,w,h = rec['fragCoords']
+            if abs(w) > 10000 or abs(h) > 10000:
+                print self.data
+                raise Exception("fragment corrupt")
             rect = QtCore.QRectF(y, x, h, w)
             self.fragments.append(QtGui.QPainter.PixmapFragment.create(pos, rect))
             
diff --git a/pyqtgraph/graphicsItems/ViewBox/ViewBox.py b/pyqtgraph/graphicsItems/ViewBox/ViewBox.py
index cf204007..654a12c9 100644
--- a/pyqtgraph/graphicsItems/ViewBox/ViewBox.py
+++ b/pyqtgraph/graphicsItems/ViewBox/ViewBox.py
@@ -1048,10 +1048,10 @@ class ViewBox(GraphicsWidget):
                 xr = item.dataBounds(0, frac=frac[0], orthoRange=orthoRange[0])
                 yr = item.dataBounds(1, frac=frac[1], orthoRange=orthoRange[1])
                 pxPad = 0 if not hasattr(item, 'pixelPadding') else item.pixelPadding()
-                if xr is None or xr == (None, None):
+                if xr is None or xr == (None, None) or np.isnan(xr).any() or np.isinf(xr).any():
                     useX = False
                     xr = (0,0)
-                if yr is None or yr == (None, None):
+                if yr is None or yr == (None, None) or np.isnan(yr).any() or np.isinf(yr).any():
                     useY = False
                     yr = (0,0)