Yes, 3-5x (peak performance) sounds quite reasonable. But 10x is not out of the question under high load for extended amounts of time (like compiling big software) when you take the form factor thermals into account. A laptop like that will start throttling quite aggressively quite quickly.
The Zenbook I have isn't a powerful computer by any measure. It's a fine laptop for light use but the CPU and thermal characteristics aren't suitable for intensive computation. I'd expect any fanless desktop computer to wipe the floor with it when it comes to perf.
This is why I rent a server at Hetzner. Considering you can get an i7 3770 for 33.61 EUR a month, it's pretty economical. It also serves as a backup (2x3TB) and occassional webhost.
The Zenbook I have isn't a powerful computer by any measure. It's a fine laptop for light use but the CPU and thermal characteristics aren't suitable for intensive computation. I'd expect any fanless desktop computer to wipe the floor with it when it comes to perf.