Hi Robert,
Unfortunately you can't really flat-out say that more ram will be faster or better without knowing more.
If your system didn't tax memory capacity before, then additional memory isn't going to be used and no benefit is seen.
Alternatively, if some other component in your system was acting as a bottleneck (cpu or harddrive in most cases) then, again, additional memory isn't going to do much because the problem is elsewhere.
Ideally you'd want to monitor resource usage before an upgrade in order to determine what part needs the upgrade.
In most cases, where a memory upgrade is truly needed, the benefit isn't likely to be seen during boot or in opening applications;
It's more likely that you'd see a benefit on a system under heavy load.
The reason is that when all the memory is used up, operating systems start to use the hard disk as second best and, sadly, it's second by a long way!
2x2gb isn't a lot these days so there's a good chance your upgrade isn't a waste; You're just not likely to see improvements in boot times etc.