Netbooks are in general "slow" compared to laptops.
First , your computers cpu is a 1.6GHz N270 Intel Atom Processor which ?s a single core processor.
Second, it has "only" 1GB DDR2 (RAM) at 533MHz speed, which is not much compared to dual core and quad core processors, that operates with more than the double speed.
Third, as you use your netbook and get more and more applications on it, Windows registration database gets slower because it has to go throug this database at every start up.
Even applications you have uninstalled and not use anymore is kept as obsolete files in the registration database.
As I understand the Acer Aspire One Netbook uses Windows XP.
If so, there is two things you can do to speed up your computers performance.
You can purchase a PC System Utilities Software such as "Advanced Sytem Optimizer" to clean up your computers registration database and do other tune ups. See this site :http://pc-system-utilities-software-review.toptenreviews.com/
If you are using either Windows XP or Windows 2000 (and only these two OS) you can perform the socalled prefetch trick .
Push the START button and select RUN
In the field write PREFETCH and hit the return button
A folder opens with all PF files. Delete them all, close the folder, empty your recycle bin and restart your computer.
It will take a little longer to open your computer than usual, but only the first time after you have deleted all the prefteched files. This is normal so do not worry.
Next time you start your computer you will see that it has been faster in the start up.
This is the best explanation I can come up with.
I hope this will help you.