CPU usage spikes while viewing webpage with java script

Can anyone tell me if it is normal for cpu use to spike up to 90% when I view a webpage that's using javascript? It is a scrolling news headline using java script 1.2 in the webpage.
Thanks

Fortunately, while my temps do go up and fan speed increases, mine does not become exceedingly loud. I apparently have a lot of good karma stored up because both the original midplane and its replacement - bad caps - have had quiet fans.

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