Same problems as above. Late 2013 Macbook Pro, 16 GB, OSX 10.13.3 2.6 GHz i7.
The problem is a runaway renderer with HWA off/on…makes no difference. Other apps running include PCcharm, sometimes serving a local nginx server, sometimes not. It does not appear on access to pages on my Apache/FreeBSD based servers, but does appear nearly always when launching a page from Foxnews to an article. The article will be excessively slow to load.
If I open the sub-article in a new screen/tab it loads promptly and the Renderer runaway does not occur as often. I’ve seen this occasionally with Marketwatch.com as well. FN support suggests it is because I don’t let spyware ads look at my computer. Even if so, there should be some means of detecting and rejecting/bypassing this ill-mannered behavior on the part of servers.