system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: Why is my 2004 Desktop Faster then my 2013 laptop?
gpt
There's no way of knowing without knowing the machines' specs.

The desktop could be a 6000$, top of the line, high end computer (for its time) whereas the laptop might be a 400$ piece of crap. 

The laptop could be riddled with viruses or just encumbered with lots of programs.

The desktop could be running a lightweight operating system, or a system more appropriate for older comptuers (for example windows xp vs. windows vista).