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    <p>You can use the advices received (use StringBuilder for example) and with Parallel extensions, use how many cores you have in your machine to do the work in parallel.</p> <p>Look at this code:</p> <pre><code>class Program { static void Main(String[] args) { // Filling the data List&lt;KeyValuePair&lt;String, String&gt;&gt; map = new List&lt;KeyValuePair&lt;String, String&gt;&gt;(); List&lt;StringBuilder&gt; strings = new List&lt;StringBuilder&gt;(); List&lt;StringBuilder&gt; strings2 = new List&lt;StringBuilder&gt;(); for (Int32 i = 0; i &lt; 50; i++) { String key = String.Format("[KEY{0}]", i); String value = String.Format("Text of KEY{0}", i); KeyValuePair&lt;String, String&gt; keyValuePair = new KeyValuePair&lt;String, String&gt;(key, value); map.Add(keyValuePair); } for (Int32 i = 0; i &lt; 1024; i++) { StringBuilder text = new StringBuilder(); foreach (KeyValuePair&lt;String, String&gt; keyValuePair in map) { text.AppendFormat("Some text before - {0} - Some text after.", keyValuePair.Key); text.AppendLine(); } strings.Add(text); strings2.Add(text); } // Measuring the normal loop Stopwatch stopwatch = new Stopwatch(); stopwatch.Start(); foreach (StringBuilder text in strings) { foreach (KeyValuePair&lt;String, String&gt; eachMap in map) { text.Replace(eachMap.Key, eachMap.Value); } } stopwatch.Stop(); Console.WriteLine("Time with normal loop: {0}", stopwatch.Elapsed); // Measuring the parallel loop stopwatch.Reset(); stopwatch.Start(); Parallel.ForEach(strings2, text =&gt; { foreach (KeyValuePair&lt;String, String&gt; eachMap in map) { text.Replace(eachMap.Key, eachMap.Value); } }); stopwatch.Stop(); Console.WriteLine("Time with parallel: {0}", stopwatch.Elapsed); Console.ReadLine(); } } </code></pre> <p>And look at some measures running on my nootebook (AMD Turion64 X2 - 2 cores):</p> <p><br /> <br /> Time with normal loop: 00:00:03.5956428 <br /> Time with parallel: 00:00:01.8707367 <br /> <br /> Time with normal loop: 00:00:02.1467821 <br /> Time with parallel: 00:00:01.4627365 <br /> <br /> Time with normal loop: 00:00:03.4123084 <br /> Time with parallel: 00:00:01.6704408 <br /> <br /> <br /> <br /></p> <p>Hope this helps.</p> <p>Ricardo Lacerda Castelo Branco</p>
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    1. USRicardo Lacerda Castelo Branco
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