I am at a loss with relating what I see from the chart to your complaint. It shows that your Mint 6 install takes only 25 seconds to boot, which is pretty much healthy albeit not stellar, and nothing is wrong--i.e. all modules are loaded fast enough and services do not take excessive amount of time to start. The strange part is your disk throughput, a mere 37 MB/s for a relatively modern system is questionable enough.
There are several tricks you can try if you want to cut down your boot time a little more. But I am not posting them here, as I ended up having a crippled system after applying them and it took me nearly a good one hour to to get it back in shape.
I will offer a solution when (if) I come up with one.