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    <p>Have you measured that the speed problem is really caused by <code>Convert.ToSingle</code>?</p> <p>In the code you included, I see you create lists and dictionaries like this:</p> <pre><code>normals = new List&lt;Vector3&gt;(); texCoords = new List&lt;Vector2&gt;(); objVerticesIndexDictionary = new Dictionary&lt;ObjMesh.ObjVertex, int&gt;(); </code></pre> <p>And then when you read the file, you add in the collection <strong>one item at a time</strong>. One of the possible optimizations would be to save total number of normals, texCoords, indexes and everything at the start of the file, and then initialize these collections by these numbers. This will pre-allocate the buffers used by collections, so adding items to the them will be pretty fast.</p> <p>So the collection creation should look like this:</p> <pre><code>// These values should be stored at the beginning of the file int totalNormals = Convert.ToInt32(textReader.ReadLine()); int totalTexCoords = Convert.ToInt32(textReader.ReadLine()); int totalIndexes = Convert.ToInt32(textReader.ReadLine()); normals = new List&lt;Vector3&gt;(totalNormals); texCoords = new List&lt;Vector2&gt;(totalTexCoords); objVerticesIndexDictionary = new Dictionary&lt;ObjMesh.ObjVertex, int&gt;(totalIndexes); </code></pre> <p>See <a href="http://msdn.microsoft.com/en-us/library/dw8e0z9z.aspx" rel="nofollow">List&lt;T&gt; Constructor (Int32)</a> and <a href="http://msdn.microsoft.com/en-us/library/tk84bxf4.aspx" rel="nofollow">Dictionary&lt;TKey, TValue&gt; Constructor (Int32)</a>.</p>
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    1. POC# - A faster alternative to Convert.ToSingle()
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    1. CO`ReadLine` shouldn't even be used in the first place, I think that's the real issue.
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      1. USMehrdad
    2. COReplaced ReadLine with substring
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      1. USIDWMaster
    3. COThis would work, assuming I KNEW the total number at the start of the file. I don't know how many Vertices, texcoords, normals, quads, etc. at the start of the file, as per the Obj specification.
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