I'm experiencing a bit of a problem with a simple task I'm doing. I'm 
trying to read a file and print something in the Transcript window 
while reading the file. The problem I find is that while Squeak is 
reading the file, the VM dedicates 100% of its processor time to that 
task. On the same VM, I'm running Seaside, so while the VM is reading 
the file, Seaside cannot render any pages. Any suggestions on how to 
overcome this problem?
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First, don't write to the Transcript directly from a non-UI task, as this 
isn't guaranteed to work correctly. If you *must* write to the transcript 
from a non-UI task, then: 

* only do it using #addDeferredUIMessage: like this:

WorldState addDeferredUIMessage: [ 
	Transcript nextPutAll: someString; 
		nextPutAll: 'something else'; cr ].

* use nextPutAll: instead of show:

* if you must force the output to be visible (which takes more CPU time 
  because the screen must be updated), then call endEntry .

Second, try to break up the writing by waiting on a Delay, and/or reduce the 
priority of the reading thread to equal or less than the priority of the 
Seaside threads.