Hello, all. Three years ago I upgraded my quad-core Mac Pro 1,1 to a 2.66 GHz octo-core setup (the 3.0 GHz quad-core Xeons were still stupid expensive back then). It was a great upgrade, and really extended the useful life of the machine. I now do a lot of work in Adobe Lightroom (the newest CC/6 edition), and I am noticing lag in the develop module, and general performance issues with this app. I already upgraded the GPU two years ago to a GTX-570. I also have 24 GB's RAM, and an all-SSD configuration. The only upgrade paths left are either a newer GPU, or a slight bump up to the 3.0 GHz quad core Xeons. Given that the PCIe version is just 1.1, I don't see a newer GPU making much difference. But a matched pair of 3.0 GHz quad-core Xeon 5365's can now be had on eBay for about $145--which is a bit less than I paid for the 5355's three years ago. Is this CPU upgrade pointless, or might the extra .340 Ghz per core be beneficial for Lightroom? Thanks for any input.