Comment 23 for bug 751689

Issue :
Hav this problem while running videos like GoogleIO on several tabs, on chrome or firefox apps (adobe flash player installed), on my dell inspiron laptops: n5030(i3,4GiB), 1525(core2 duo3GiB), & on latitude e5420(i7-2620M, 8GiB), which on prolonged CPU usage(all cores) of over 100% just SHUTDOWN (processes killed).
My old dell inspiron-6400(dual core,4GiB), HP-530(dual core,2GiB), do go high on CPU usage, but get stable (on watch).
The Dell Desktop(Pentium D, 2GiB) works just fine (with other issue - wifi conn suddenly droppd).
All this... while the ancient HP Pavilion(AMD64Athlon) is handling 10.10 well & the ancient dell-celeron(128Mib) runs XUbuntu smoothly.

Resolution :
Waiting for the system to settledown (on startup), then, monitoring the CPU usage, using System-Monitor, & a lil patience has helped most times.

 Running one video and a few regular pages on the browser apps, jets the CPU to over 90~95% , then drops to around 30~40% and stabilized, though opening more links (one or more) shoots the CPU near perfect. At this point, I have been switching to the System-Monitor and just WAIT for the CPU history graph to come down.. It comes back to below 50%. Opening another app, like Eclipse, or Gimp takes the CPU usage to around 65~75% and comes back down to around 40~50%.
 For me, the pain point is tabbed-browsing. While opening more tabs, not scrolling through the pages seems to help get the CPU history graph back to <50%.

Hope the info helps the learned help me out here.