Thanks, Ive filed a bug report here and they seem to be working on it:
https://code.google.com/p/chromium/issues/detail?id=567745

On Tuesday, December 8, 2015 at 12:24:46 AM UTC-8, Floh wrote:
>
> First thing you should do is test in the latest Chrome Canary version 
> (currently at v49) to see if this is a temporary regression which has 
> already been fixed.
>
> Next you should write a ticket in the Chromium issue tracker: 
> https://code.google.com/p/chromium/issues/list.
>
> My experience is that if it is a fairly obvious and reproducible problem, 
> and especially something that works in other browsers, then someone will 
> get working on it pretty fast.
>
> PS: I'm also seeing the problem on OSX 10.11 with Chrome v49 (current 
> Canary) and Chrome v47, both 64-bit, so it looks like it isn't fixed. You 
> should describe in the ticket where exactly to look (loading bar at bottom 
> left), because the webpage as a whole appears to be working just fine and I 
> didn't notice the subtle loading bar at first :)
>
> Am Dienstag, 8. Dezember 2015 08:02:21 UTC+1 schrieb Brentan Alexander:
>>
>> BTW I decided to sit and wait...Chrome 47 will *eventually* unfreeze and 
>> do what it is supposed to do, but we are talking many minutes of waiting 
>> for it to do whatever it was doing.  So it WILL eventually work, but after 
>> a completely unacceptable delay while it crunches on something....
>>
>> On Monday, December 7, 2015 at 11:00:45 PM UTC-8, Brentan Alexander wrote:
>>>
>>> Im using a port of the Giac math library for a project I am working on. 
>>>  I have compiled this using emscripten and it has been working without 
>>> issue for months.
>>>
>>> Starting early this week, my project suddenly freezes on Chrome, no 
>>> changes at all on my end.  I have narrowed it down to the latest update of 
>>> Chrome (version 47).  Chrome 46 works fine, firefox works fine, safari 
>>> works fine, but Chrome 47 crashes (the browser simply hangs, developer 
>>> tools don't respond, the process eats 100% CPU and I have to kill it). 
>>>  Tested on both mac and PC with same results (chrome 46 works fine, chrome 
>>> 47 is broken).
>>>
>>> Interestingly, if I remove compiler optimizations and compile everything 
>>> with -o0 the project will run in Chrome 47...but its obviously not 
>>> optimized and a very large file.  With -o1 and up it runs in 
>>> firefox/safari/chrome 46 but not chrome 47.  Compiling with emscripten 
>>> 1.35.0.
>>>
>>> Anybody have any bright ideas on how I can troubleshoot this or 
>>> determine what the issue is?  Or best place to raise with chrome devs?  If 
>>> you want to look yourself you can try this URL...the 'loading' bar will 
>>> freeze on Chrome 47 (and the webworker running the emscripten file will 
>>> become unresponsive):
>>>
>>> https://www.swiftcalcs.com/worksheets/f41efdca8dc811b3b5aea35b4e415312/The_Pythagorean_Theorem
>>>
>>> Thanks for the help!
>>>
>>

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