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    <p>Apart from the problem writing to the console, you also have a <strong>O(m*n) runtime</strong> for n being the number of lines in the file and m being the number of messages. This is bad if m or n is big. You can reduce this to an O(n) operation by using a <code>Dictionary</code> instead and eliminating the inner loop. </p> <p>You can put your messages in a <code>Dictionary</code>, using the Time as a key. In the loop you only have to ask the dictionary for the messages at a specific time:</p> <pre><code> string fmtLine = ""; string[] splitedFmtLine; int counterFMTlines = 0; var messageTimes = new Dictionary&lt;string, LinkedList&lt;L3Message&gt;&gt;(); foreach (L3Message message in rez) { LinkedList&lt;L3Message&gt; list=null; messageTimes.TryGetValue(message.Time, out list); list = list ?? new LinkedList&lt;L3Message&gt;(); list.AddLast(message); messageTimes[message.Time] = list; } foreach (string fmtF in fmtFiles) { using (StreamReader sr = new StreamReader(fmtF)) { while ((fmtLine = sr.ReadLine()) != null) { //Console.WriteLine(counterFMTlines++); splitedFmtLine = fmtLine.Split('\t'); LinkedList&lt;L3Message&gt; messageList = null; messageTimes.TryGetValue(splitedFmtLine[0], out messageList); if(messageList != null) { foreach (var message in messageList) { message.ScramblingCode = splitedFmtLine[7]; } messageTimes.Remove(splitedFmtLine[0]); //see comments } if(messageTimes.Count==0) break; //see comments } } if(messageTimes.Count==0) break; //see comments } </code></pre> <p>This should be super fast.</p> <p><strong>Edit:</strong> I changed the example so that it supports cases where there is more than one message for one time.</p> <p><strong>Edit2:</strong> I added an optimization based on the fact that message time and ScramblingCode always correlate (see comments).</p>
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    1. POC# very slow StreamReader
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    1. COThis looks great... I'll tested when my VS profiler is finished.
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    2. COThx for edit... Here is catch, in FMTfile, there is multiple lines with same time, but I need only one (for same time ScramblingCode is same). Do u think that here is some possible optimisation?
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    3. COCan there be more than one message with the same time where you have to set the scrambling code?
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