The real bottleneck with PS these days is not the processor speed but the disk read/write speed. 150MB files are not that large - i've worked on 2GB+ files hundreds of layers and you really feel the disk limitations there. (20 min to save) Get a second (fastest you can get) internal HDD to use as a scratch disk, it really speeds things as long as the drive is empty. And finally get as much ram as you can afford, Photoshop loves ram and this is what you need if you want to have many apps open.
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