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If you graphed it, it would be very "spikey". Anything less than 100% means CPU "cycles" are going to waste. Your CPU is "twiddling its thumbs" and not being used to its full capability.
The UD Agent uses that otherwise wasted time (known as "idle cycles") to perform its calculations. In other words, it uses up all of the CPU cycles after every other program that is running has used up all they can. It's last in line, but doesn't let anything go to waste, so your CPU utilization will always be at 100%.
Thanks to RClarkofNC for this post.