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    <p><code>System.Int32.Parse</code> is slowlest, because it used <code>CultureInfo</code>, <code>FormatInfo</code> and etc; and performance reason is not in the temporary strings.</p> <p>Code from reflection:</p> <pre><code>private unsafe static bool ParseNumber(ref char* str, NumberStyles options, ref Number.NumberBuffer number, NumberFormatInfo numfmt, bool parseDecimal) { number.scale = 0; number.sign = false; string text = null; string text2 = null; string str2 = null; string str3 = null; bool flag = false; string str4; string str5; if ((options &amp; NumberStyles.AllowCurrencySymbol) != NumberStyles.None) { text = numfmt.CurrencySymbol; if (numfmt.ansiCurrencySymbol != null) { text2 = numfmt.ansiCurrencySymbol; } str2 = numfmt.NumberDecimalSeparator; str3 = numfmt.NumberGroupSeparator; str4 = numfmt.CurrencyDecimalSeparator; str5 = numfmt.CurrencyGroupSeparator; flag = true; } else { str4 = numfmt.NumberDecimalSeparator; str5 = numfmt.NumberGroupSeparator; } int num = 0; char* ptr = str; char c = *ptr; while (true) { if (!Number.IsWhite(c) || (options &amp; NumberStyles.AllowLeadingWhite) == NumberStyles.None || ((num &amp; 1) != 0 &amp;&amp; ((num &amp; 1) == 0 || ((num &amp; 32) == 0 &amp;&amp; numfmt.numberNegativePattern != 2)))) { bool flag2; char* ptr2; if ((flag2 = (((options &amp; NumberStyles.AllowLeadingSign) == NumberStyles.None) ? false : ((num &amp; 1) == 0))) &amp;&amp; (ptr2 = Number.MatchChars(ptr, numfmt.positiveSign)) != null) { num |= 1; ptr = ptr2 - (IntPtr)2 / 2; } else { if (flag2 &amp;&amp; (ptr2 = Number.MatchChars(ptr, numfmt.negativeSign)) != null) { num |= 1; number.sign = true; ptr = ptr2 - (IntPtr)2 / 2; } else { if (c == '(' &amp;&amp; (options &amp; NumberStyles.AllowParentheses) != NumberStyles.None &amp;&amp; (num &amp; 1) == 0) { num |= 3; number.sign = true; } else { if ((text == null || (ptr2 = Number.MatchChars(ptr, text)) == null) &amp;&amp; (text2 == null || (ptr2 = Number.MatchChars(ptr, text2)) == null)) { break; } num |= 32; text = null; text2 = null; ptr = ptr2 - (IntPtr)2 / 2; } } } } c = *(ptr += (IntPtr)2 / 2); } int num2 = 0; int num3 = 0; while (true) { if ((c &gt;= '0' &amp;&amp; c &lt;= '9') || ((options &amp; NumberStyles.AllowHexSpecifier) != NumberStyles.None &amp;&amp; ((c &gt;= 'a' &amp;&amp; c &lt;= 'f') || (c &gt;= 'A' &amp;&amp; c &lt;= 'F')))) { num |= 4; if (c != '0' || (num &amp; 8) != 0) { if (num2 &lt; 50) { number.digits[(IntPtr)(num2++)] = c; if (c != '0' || parseDecimal) { num3 = num2; } } if ((num &amp; 16) == 0) { number.scale++; } num |= 8; } else { if ((num &amp; 16) != 0) { number.scale--; } } } else { char* ptr2; if ((options &amp; NumberStyles.AllowDecimalPoint) != NumberStyles.None &amp;&amp; (num &amp; 16) == 0 &amp;&amp; ((ptr2 = Number.MatchChars(ptr, str4)) != null || (flag &amp;&amp; (num &amp; 32) == 0 &amp;&amp; (ptr2 = Number.MatchChars(ptr, str2)) != null))) { num |= 16; ptr = ptr2 - (IntPtr)2 / 2; } else { if ((options &amp; NumberStyles.AllowThousands) == NumberStyles.None || (num &amp; 4) == 0 || (num &amp; 16) != 0 || ((ptr2 = Number.MatchChars(ptr, str5)) == null &amp;&amp; (!flag || (num &amp; 32) != 0 || (ptr2 = Number.MatchChars(ptr, str3)) == null))) { break; } ptr = ptr2 - (IntPtr)2 / 2; } } c = *(ptr += (IntPtr)2 / 2); } bool flag3 = false; number.precision = num3; number.digits[(IntPtr)num3] = '\0'; if ((num &amp; 4) != 0) { if ((c == 'E' || c == 'e') &amp;&amp; (options &amp; NumberStyles.AllowExponent) != NumberStyles.None) { char* ptr3 = ptr; c = *(ptr += (IntPtr)2 / 2); char* ptr2; if ((ptr2 = Number.MatchChars(ptr, numfmt.positiveSign)) != null) { c = *(ptr = ptr2); } else { if ((ptr2 = Number.MatchChars(ptr, numfmt.negativeSign)) != null) { c = *(ptr = ptr2); flag3 = true; } } if (c &gt;= '0' &amp;&amp; c &lt;= '9') { int num4 = 0; do { num4 = num4 * 10 + (int)(c - '0'); c = *(ptr += (IntPtr)2 / 2); if (num4 &gt; 1000) { num4 = 9999; while (c &gt;= '0' &amp;&amp; c &lt;= '9') { c = *(ptr += (IntPtr)2 / 2); } } } while (c &gt;= '0' &amp;&amp; c &lt;= '9'); if (flag3) { num4 = -num4; } number.scale += num4; } else { ptr = ptr3; c = *ptr; } } while (true) { if (!Number.IsWhite(c) || (options &amp; NumberStyles.AllowTrailingWhite) == NumberStyles.None) { bool flag2; char* ptr2; if ((flag2 = (((options &amp; NumberStyles.AllowTrailingSign) == NumberStyles.None) ? false : ((num &amp; 1) == 0))) &amp;&amp; (ptr2 = Number.MatchChars(ptr, numfmt.positiveSign)) != null) { num |= 1; ptr = ptr2 - (IntPtr)2 / 2; } else { if (flag2 &amp;&amp; (ptr2 = Number.MatchChars(ptr, numfmt.negativeSign)) != null) { num |= 1; number.sign = true; ptr = ptr2 - (IntPtr)2 / 2; } else { if (c == ')' &amp;&amp; (num &amp; 2) != 0) { num &amp;= -3; } else { if ((text == null || (ptr2 = Number.MatchChars(ptr, text)) == null) &amp;&amp; (text2 == null || (ptr2 = Number.MatchChars(ptr, text2)) == null)) { break; } text = null; text2 = null; ptr = ptr2 - (IntPtr)2 / 2; } } } } c = *(ptr += (IntPtr)2 / 2); } if ((num &amp; 2) == 0) { if ((num &amp; 8) == 0) { if (!parseDecimal) { number.scale = 0; } if ((num &amp; 16) == 0) { number.sign = false; } } str = ptr; return true; } } str = ptr; return false; } public static int Parse(string s) { return Number.ParseInt32(s, NumberStyles.Integer, NumberFormatInfo.CurrentInfo); } internal unsafe static int ParseInt32(string s, NumberStyles style, NumberFormatInfo info) { byte* stackBuffer = stackalloc byte[1 * 114 / 1]; Number.NumberBuffer numberBuffer = new Number.NumberBuffer(stackBuffer); int result = 0; Number.StringToNumber(s, style, ref numberBuffer, info, false); if ((style &amp; NumberStyles.AllowHexSpecifier) != NumberStyles.None) { if (!Number.HexNumberToInt32(ref numberBuffer, ref result)) { throw new OverflowException(Environment.GetResourceString("Overflow_Int32")); } } else { if (!Number.NumberToInt32(ref numberBuffer, ref result)) { throw new OverflowException(Environment.GetResourceString("Overflow_Int32")); } } return result; } private unsafe static void StringToNumber(string str, NumberStyles options, ref Number.NumberBuffer number, NumberFormatInfo info, bool parseDecimal) { if (str == null) { throw new ArgumentNullException("String"); } fixed (char* ptr = str) { char* ptr2 = ptr; if (!Number.ParseNumber(ref ptr2, options, ref number, info, parseDecimal) || ((ptr2 - ptr / 2) / 2 &lt; str.Length &amp;&amp; !Number.TrailingZeros(str, (ptr2 - ptr / 2) / 2))) { throw new FormatException(Environment.GetResourceString("Format_InvalidString")); } } } </code></pre>
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    1. POFaster parsing of numbers on .NET
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    1. COInteresting. @JonHarrop should measure the performance of using his simpler int parser on a substring version, just to make sure the root cause of the 5x is fully understood.
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    2. COIt's probably a bit of both. In my similar situation I made performance gains from custom integer parsing (because I could assume a single format) and from not cutting up my input string.
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    3. CO@fmr "@JonHarrop should measure the performance of using his simpler int parser on a substring version, just to make sure the root cause of the 5x is fully understood". Split into substrings takes 0.7s. Split into substrings and map my fast int parser over them takes 0.99s. There are other forces at work here though.
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