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Your rMBP has a processor that is many times more advanced than the G5, has a faster system bus, and probably most significantly uses ultra fast PCIe-based flash storage. A G5 can still be quite competent when properly optimized, but there's no way it's ever going to feel as fast or responsive as an rMBP.
 
Your rMBP has a processor that is many times more advanced than the G5, has a faster system bus, and probably most significantly uses ultra fast PCIe-based flash storage. A G5 can still be quite competent when properly optimized, but there's no way it's ever going to feel as fast or responsive as an rMBP.
Even the 2012 rMBP is better than the G5?
 
Yes, for all the reasons I listed. The newest rMBPs are not appreciably different from the first generation. They have improved, but the difference between a G5 and an even a 2008 or so Intel Mac is pretty dramatic.

Part of the difference too is that code is no longer optimized for PPC processors.

What speed is your G5 and how many processors/cores does it have?
 
Any i5/i7 Mac will be a lot faster than a G5... That's just do to more processor cache and better technology. The PCIe SSD is super fast, and the DDR3 RAM is faster than the DDR2 in the G5 another thing is the graphics, the Iris graphics in the rMBP is a lot better than the GeForce 6600LE in you G5
 
Your G5 Mac is about the speed of a low clock Core 2 Duo or high clocked Core Duo, these CPUs (excluding the Core 2 Duo) are pretty out dated at this point. G5 Macs were around in 2003-2005 and matched most consumer PCs up until 2008. When Core 2 Quads and i3 / i5 / i7 and even high clocked Core 2 Duos came around, the G5 just got old. The world's advanced 10 years since your G5, so of course it's not as fast as a new PC. It's not slow, it'll never be slow, just won't be as fast as the latest hardware.
 
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Well - it just feels slow compared to my rMBP.
Keep in mind there are 7 years separating the two Macs, and the switch to the Intel Mac Pros was a major leap forward, of course the G5 will feel slow compared to your rMBP. Especially if it still has the stock HDD.
 
Keep in mind there are 7 years separating the two Macs, and the switch to the Intel Mac Pros was a major leap forward, of course the G5 will feel slow compared to your rMBP. Especially if it still has the stock HDD.
True. Good point. The G5 has a good design.
 
For 2005 ... yes.

Compare the benchmarks and the 2012 MBP is about 5x quicker just on CPU benchmarks, not taking into account that the PowerPC macs are out of any manufacturer or software support.
I think he means design by the case
 
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