I have a simple structured XML file like this:

<ttest ID="ttest00001", NickName="map00001"/>
<ttest ID="ttest00002", NickName="map00002"/>
<ttest ID="ttest00003", NickName="map00003"/>
<ttest ID="ttest00004", NickName="map00004"/>

..... This xml file can be around 2.5MB.

In my source code I will have a loop to get nicknames

In each loop, I have something like this:

nickNameLoopNum = MyXmlDoc.SelectSingleNode("//ttest[@ID=' + testloopNum + "']").Attributes["NickName"].Value

This single line will cost me 30 to 40 millisecond.

I searched some old articles (dated back to 2002) saying, use some sort of compiled "xpath" can help the situation, but that was 5 years ago. I wonder is there a mordern practice to make it faster? (I'm using .NET 3.5)