Application Hangs

[D V Du]

Using Mac, 4.4.1, on newest Yosemite,  Text Document goes to 99 - 100% 
CPU (and stays above 95%) and shows one new 'Recent Hangs' every 5 
seconds.  It also shows 1000 context switches PER SECOND ---...   During 
quiescence,  stays above 90% except after non-use for 10 minutes.  Has 
many context switches even during quiescence.

On exact same context, Text Document 4.3.6.2 shows average between .03 
and 99%, only showing 99% CPU when actually active.  During quiescence 
it gets down to .03 regularly, within 30 seconds.  Has only a few 
context switches during quiescence.

Each of above was in same configuration, same document, same 
applications and background processes running and with 16G of storage.  
Each version showed about 250M real memory and about 3.6G of virtual 
memory.

In each case, I deleted caches and preferences before running. In each 
case, I used the same document (a 30 page table with simple formatting) 
and repeated the 'test' with that same document twice (or more) to be 
sure that it was not a corrupted document.

D