What just happened? I was on a CNBC page using Safari watching a YouTube video. Safari was the only thing I had open. Only a single tab. Suddenly my brand new 2017 13" MBP (non-touch bar) started heating up. I get this message at the top of the page: "This webpage is using significant memory. Closing it may improve the responsiveness of your Mac," as you can see here: At this point the fan is going like crazy. Really loud. So I checked activity monitor: Would appreciate it if somebody could help me read these results. What is VTDecoderXPCService? How can a single webpage make my MBP go berserk? Is this a case for more RAM or just a freak occurrence on a very bad webpage? Nothing like this has ever happened to me before. BTW my mid-2010 MB fan was much quieter. Why are the new ones so loud?