It’s significant already. If I get the math right (warning, I’m on my phone in bed at 3am and it’s been 10 years) I think that a 1 inch chip running at 3GHz clock rate could, if you aren’t careful with the design of the clock network, end up with half a clock cycle physically fitting on the chip. That is, the trace that was supposed to move the signal from one end of the chip to the other, would instead see the clock signal as a standing wave, not moving at all. (Of course people has (tried?) to make use of that effect. I think it was called “resonant clock distribution” or some such)

Yep, that’s what brought me over to XFCE for several years. Back at KDE again, though