Reusing client in a WCF service in .Net 3.5 - wcf

Question

I understand that ClientBase<> has inbuilt caching added to it for the channel factories. But it should be in later versions of .Net (4.5) : more here
Now, am having a simple sample project to see if the same client is reused or a new is created for every call to analyse the time taken. Below is some code snippet:
[ServiceContract]
public interface ISoapService
{
[OperationContract]
string GetData(int value);
}
Client Code:
private static void NonCachedVersion()
{
Console.WriteLine("Non-Cached Version");
for (int i = 0; i < 5; i++)
{
var watch = Stopwatch.StartNew();
using (var client = new SoapServiceReference.SoapServiceClient())
{
client.GetData(5);
watch.Stop();
}
Console.WriteLine("{0}: {1}ms", i, watch.ElapsedMilliseconds);
}
}
private static void CachedVersion()
{
Console.WriteLine("Cached Version");
using (var client = new SoapServiceReference.SoapServiceClient())
{
for (int i = 0; i < 5; i++)
{
var watch = Stopwatch.StartNew();
client.GetData(5);
watch.Stop();
Console.WriteLine("{0}: {1}ms", i, watch.ElapsedMilliseconds);
}
client.Close();
}
}
Calling them:
static void Main(string[] args)
{
NonCachedVersion();
Console.WriteLine();
CachedVersion();
Console.ReadLine();
}
And here's the output:
Non-Cached Version
0: 2030ms
1: 22ms
2: 19ms
3: 21ms
4: 18ms
Cached Version
0: 19ms
1: 7ms
2: 7ms
3: 7ms
4: 8ms
Also, if I call the cached version first and then the non-cached version, timings are follows:
Cached Version
0: 2275ms
1: 13ms
2: 8ms
3: 8ms
4: 8ms
Non-Cached Version
0: 19ms
1: 18ms
2: 18ms
3: 18ms
4: 19ms
Thus, it is essentially the first call that is expensive, rest seem to be utilizing some sort of cache.
So, few things:
For Non-cached version - even though the client is disposed after every call, next client create is very fast compared to the first call. Caching of the channel happening despite dispose?
For Cached version - time is less than non-cached version as its taking that extra time to create the client object. Correct?
Product is compiled for .Net 3.5, is caching enabled in that for the channels? I see that the CacheSetting property is added in .Net 4.5 only.