2.6 ghz does not tell us much.
There is a 2.6ghz version of a Celeron, Pentium, Core 2 Duo, and Core 2 quad. Each of them perform very different. There is even different generations that will make a marginal difference.
Please give us the exact model of the CPU.
If you do not know it you can right click on "computer" in your start menu, select properties, and it will tell you