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Not only do you not want to run a heavy desktop like Unity or GNOME, you also don't want to judge the speed based on how well it runs off a LiveCD. LiveCDs are slow enough simply by being LiveCDs without compounding the problem by running heavy desktops.
You can get a little better speed by running the Live session from a USB, but that stil won't be as fast as your computer would run when the OS is booted off the internal HDD.
If your HDD is big enough, you might want to repartition and try installing a more recent OS onto a different partition, that way you don't have to worry about reinstalling multiple times over your current OS just to revert.
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