Re: "as fast as the fastest PCs."
but I run rather heavy (and well parallellised) image processing code
How much of this can be done by the GPU? I suspect that RAM and bandwidth might be the limiter here, but, yeah, I suspect it will run significantly slower if at all on I-Pad than it does on your current hardware.
I've nothing per se against the I-Pad route (for many tasks a suitable replacement for a notebook), except that I do want full control of the OS so that I can install my own libraries. Wonder if there will ever be a version of IOS that gives us a terminal and sudo?