With larger databases, on up-to-date hardware (especially HDD speed 7200RPM or better), ACT! 10 will actually out-perform ACT! 6.0... and 10 has many great new features that it can take ACT! 6.0 users a while to find.
[After Act is installed, why does the disk drive speed matter?]
Programs are classed as compute bound, I/O bound ot neutral, depending on where their operational bottleneck occurs. A program like Word is generally neutral, you load the main body of the program and open the document you are working on and then most everything takes place in memory and because typing speed is slow relative to the computer processor. A graphics program like AutoCAD tends to be compute bound because of all the lengthy computations required to display the graphics so that the processor and memory speed becomes very important. The ACT! program is I/O bound for two reasons. The complexity of the program means that the entire program can't fit in memory so the program is required to load and unload modules as they are required. The other factor is that the entire database does not load into memory, only that limited part that your are working with right now. That means that when you move from one contact record to another, that new information needs to be retrieved from the hard disk.
I hope this helps explain why the hard disk speed is very important to the ACT! program. By the way, the typical laptop from a couple of years ago had a 4200 RPM hard drive.
Roy Laudenslager ACT! Certified Consultant Techbenders email@example.com
RAM and drive speed makes all the difference with the SQL based Act products. People get a shock when moving from v6 to later products as v6 would run on just about anything, however things have moved on.