Which features make a laptop fast for Java development?

Programmer Question

I remember, earlier CPU speed was the most important thing. But today I am confused. Which features determine the most if a laptop can smoothly run Eclipse with lots and lots of projects open?

• CPU clock speed vs number of cores?
  
  
  
  • What is faster, 4 cores at 1 Ghz or 2 cores at 2,3 Ghz?
  
  
  • Which configuration needs more power = less battery life?
  
  


• memory size? Will more than 4GB help a lot?


• hard disk type -- is a SSD really that much faster? Which type?


• are there laptops without DVD/CD drive that are still super-fast?


• I'm looking for laptops with at least 1400 x 1050 pixels


• Have anti-glare-displays died?


• Can we get non-extra-wide displays?

Bonus question: What website compares laptops along these features?

Find the answer here