[quote="pikeh"]Thinking of spending my last part of my student loan on this game ]
Here's the technical explanation of cache etc.

Cache just acts as an area of fast memory where instructions can be stored so that the processor can grab them with minimal delay after it's finished executing it's current instructions. It therefore has no effect on the clock speed of your processor which is the amount of instructions per second that can be handled at a basic level. That said however, various processor have different optimization techniques, for example SIMD (more commonly known as MMX, 3DNow!, SSE, SSE2, SSE3, etc.) which stands for Single Instruction, Multiple Data allows a processor to execute multiple instructions in a single processor cycle. In your case, a 1.8Ghz processor runs at a frequency of 1,800,000,000 instructions per second. SSE3 allows operation on 4 floating point (decimal) numbers in one instruction, so a 3D coordinate transform which might usually require 4 individual instructions will only require one instruction on a processor with SSE3 support assuming the application is written to make use of SIMD. I'm not entirely sure what optimizations the Pentium-M processors make in terms of getting more operations per-cycle but using the explanation of SIMD above you can see that clock speed really isn't everything. 2MB is a fairly large amount of cache for a 1.8Ghz processor so it's a pretty good bet that your laptops 1.8Ghz processor is doing something to pull instructions through faster than your average 1.8Ghz chip as it obviously needs the capability of storing more instructions in fast memory (cache) ready for execution than the usual processors.
...Or to cut a long story short, your processor clearly has the capability to execute instructions much faster than your average 1.8Ghz processor
My girlfriend has classic 2.6Ghz processor in her laptop whilst my new laptop is an Pentium-M 2.13Ghz with an ATI X-300 in and it runs DAoC extremely smooth (faster than my 2.8Ghz, GeForce 3 desktop also) in comparison to hers, despite her much higher clock speed.