I was going to respond to this earlier but I decided not to. There is no 
logical reason a 64 bit app would run slower than a 32 bit one. Certainly not 
noticably slower. In fact, there is every reason to expect it to be faster in 
some respects, as the pipe to the processor is twice as wide. Not sure why 
Mark's benchmarks do not reflect that, but I am not an engineer. 

Of course the real benefit is that an app has access to more memory as the 
address space increases dramatically. 

Bob S

> On Jun 8, 2017, at 01:18 , Mark Waddingham via use-livecode 
> <use-livecode@lists.runrev.com> wrote:
> On 2017-06-07 22:14, hh via use-livecode wrote:
>> 64bit mode usually makes apps slower. So what's Apple's intention?
>> To make their own apps "relatively faster" by making all others slower?
> Do you have some benchmarks to back that up? I'd be interested to know what 
> sort of workloads the difference in processor affects.
> For example, I ran the simple benchmarks we have in the engine source tree 
> using Community 8.1.3 once for 32-bit and once for 64-bit. The first number 
> is 64-bit, the second 32-bit:

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