Processor clock speed doesn't matter (unless, of course, it is 0; then you might have a problem). You mention the Core i5–6200U processor. I own a laptop with it. So, to answer your question, a 2.3 GHz processor is good for just about any task that any processor is good for.
Herein, what is the meaning of 2.4 GHz?
The term GHz means giga hertz. CPU clock speed, or clock rate, is measured in Hertz — generally in gigahertz, or GHz. A CPU's clock speed rate is a measure of how many clock cycles a CPU can perform per second. For example, a CPU with a clock rate of 2.4 GHz can perform 2,400,000,000 clock cycles per second.
What is 1.8 GHz processor?
It is typically measured in megahertz or gigahertz. One megahertz is equal to one million cycles per second, while one gigahertz equals one billion cycles per second. This means a 1.8 GHz processor has twice the clock speed of a 900 MHz processor.
Is a 2.6 GHz processor good?
Definately a good speed for a laptop, yes it does. You have quality gaming laptops like the Lenovo Ideapad 700 15.6" Laptop certainly, outmatches numerous laptops around the same price with it's spectacular specifications. Its specs are at the highest quality such as: Intel Core i7-6700HQ processor, 2.6GHz.