Question

I am using a stopwatch start and stop in order to find out the time of process of a web service how ever when I refresh the page in order to do another test using the same parameters, data an all but the second and all the other test bring back different results. But when I restart the IIS server it again shows the initial result.

So my question is why do I receive a different result in time the first time?

By the way I wrote the web service in C#.

Answer 1

To understand why it’s much slower the first time, consider what has to happen the first time:

1. Assemblies must be loaded from disk.
2. The code will be jitted, which means that it must be translated from IL to machine code.
3. The pages (.cshtml/.aspx) must be parsed. Once parsed, their compiled representation is stored in memory and immediately available upon subsequent requests.

Generally speaking, none of that has to happen the second time you load the page. There are potentially countless other things that happen the first time and are then cached. This is why subsequent refreshes will usually be much faster.