For local compiles with good I/O I use RAM drives, hosting most of the project, the IDE and the compiler/jvm on RAM drives. The files are backed up on a git repository on the hard drive, so I don't have to worry about data loss if the RAM drive has problems.
If you have to use a laptop, throw away the useless DVD drive and change it with a second HDD/SSD.
Many of the better laptops can also have a second mini-PCIE slot for an internal 3G modem. Install a modem there. This will help you a lot: 1) Internet access everywhere, 2) you don't have to worry about signal (the internal antenna is bigger and better) 3) you don't have to worry about crappy USB modems and their crappy drivers.
If you have to use a laptop, throw away the useless DVD drive and change it with a second HDD/SSD.
Many of the better laptops can also have a second mini-PCIE slot for an internal 3G modem. Install a modem there. This will help you a lot: 1) Internet access everywhere, 2) you don't have to worry about signal (the internal antenna is bigger and better) 3) you don't have to worry about crappy USB modems and their crappy drivers.