cs4Recently, I upgraded to CS4 suite.  It took me a while.  I didn’t want to pay for what I thought was such a minor version update.  It was running slow on my windows 7 64 bit machine.  Zoom in and outs were sluggish and so was vertical scrolling.  The fix seems to be easy though:

disabling OpenGL support (in Edit> Preferences > Performance> Uncheck Enable OpenGL Drawing ).

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