I can now make an informed "speculation" that the 1.6 update isn't a  
huge improvement.

On Oct 31, 2007, at 6:58 AM, Tony Bigbee wrote:

> If you're willing to read through the gazillion posts to Apple's
> java-dev list on this subject, you can absorb a lot.
> But Apple just put out a tech note on 'resolved issues', but there is
> at least one tech note to come in the near future.  Some people have
> speculated that 1.6 for Leopard will be out, at least in Preview form
> soon.
>
> http://developer.apple.com/releasenotes/Java/JavaLeopardRN/index.html
>
> Also, on Leopard running 1.5 you can't invoke the 64-bit mode (-d64)
> on anything but a Core 2 Duo.
>
> On 10/31/07, Miles T. Parker <[log in to unmask]> wrote:
>> Argh..I just ordered it! Couldn't find a whole lot about this issue
>> online, except that 1.6 isn't included, which doesn't surprise me at
>> all. I'm wondering if this mainly impacts visualization or if it is
>> GUI in general (I don't care so much about 1.6 improvements to Swing
>> as I'm spending much of my time in Eclipse these days..) Or..eh..if
>> it is Java performance altogether, that would really suck. I think
>> I'll install it on my wife's MacBook first..
>>
>> On Oct 30, 2007, at 9:56 PM, Sean Luke wrote:
>>
>>> You've probably heard: OS X 10.5 (Leopard) runs Java exceptionally
>>> slowly if at all.  This is because they've turned off OpenGL
>>> hardware acceleration (or what little of it they had in 10.4).
>>> I've been told that a number of Java simulation environments, such
>>> as Processing, are having difficulty.  I have not tested MASON
>>> under Leopard and cannot verify that it will run well or not.  But
>>> given Leopard's serious Java problems, you may wish delaying any
>>> upgrade until a later version (10.5.1, perhaps).
>>>
>>> Sean
>>