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Only partial truth. I have generally found the situation to be wildly variable and greatly affected by various point revisions. Generally it has been mildy acceptable and never as smooth or consistent as osx and win7.
There are qt and kde apps that are quite a bit smoother on windows than on linux using the Xrender backend.
And one of the things that really gets to me is the fact that both major compositors seem to become sluggish and act weirdly after some uptime.