If your Web browser of choice is Internet Explorer, version 8 (IE8), you may occasionally find your CPU usage spikes to 100 percent when the browser is running. Several factors may be causing this issue.
Caches and Cookies
A glut of cache data and/or Web browser cookies could cause a sudden spike in CPU usage when you open IE8. Try clearing your cache and deleting your cookies and see if that reduces the strain on your CPU.
Smooth scrolling is a major CPU hog. To disable it, go to Tools > Internet Options > Advanced, and uncheck the Smooth Scrolling box. Your browser experience may seem a little more jumpy, but your CPU usage should drop.
If you have multiple tabs and/or windows open in IE8, this may also be putting massive strains on your CPU. Close all windows/tabs you are not actively using.
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