Just opening one tab of the following sites takes CPU to 99-100%.
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veeraa last edited byen.miui.com 
 Gearbest.com
 banggood.com
 You see the pattern right...most of these Chinese sites.
 Even if its just 1 tab. this keeps happening, which is very frustrating & not just opera, my whole rMBP becomes usable till I somehow kill that tab.
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precaststone last edited bynot for me, i'm on developer version 41 , those sites open ok, activity monitor bumps to 38% initially then drops down to 3%