That's one of the top 5 questions people ask, but not much answers. For the EOF 
cache, you can use the ERJGroupsSynchronizer to synchronize EOs between 
instances.

> Hi everyone,
> 
> Based on using WO for the last 7 years, I have observed a couple of things 
> that seem to be a performance bottleneck in WebObjects.  I know that Apple 
> uses WebObjects on a large scale for iTunes and ecommerce, so there must be 
> solutions to these.
> 
> #1 - Only one thread can be processing at once.  I seem to recall that this 
> is a limit in EnterpriseObjects but it's been a while.
> 
> #2 - EnterpriseObjects caches every object from the database.
> 
> With that being said, how can you horizontally scale your application layer?  
> If you setup more instances of your app, they each have their own caches, 
> which will be out of sync with each other.  Is there a commonly used 
> framework for doing distributed cache management?  And is it possible to make 
> your applications multithreaded so page requests can be processed 
> concurrently?
> 
> Thanks!
> 
> Greg
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