If you're playing over the internet with both versions at the same time, it will definitely cause lag as they use the same ports for communications. Only run one copy of JJ2 at a time, especially when playing on the internet.
The other programs shouldn't be a problem with a 1.3GHz computer, except for KaZaA which might lag you if there are too many uploads\downloads. Try setting a low cap on the number of each, or even try playing without it running.
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With our extreme gelatinous apology,
We beg to inform your Imperial Majesty,
Unto whom be dominion and power and glory,
There still remains that strange precipitate
Which has the quality to resist
Our oldest and most trusted catalyst.
It is a substance we cannot cremate
By temperatures known to our Laboratory.
~ E.J. Pratt
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