blocks|key|3043608|text|在编译程序时，编译器实际上：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|3043609|词汇分析(标记化)|unordered-list-item|3043610|语法分析(解析)|3043611|语义分析(检查语言规则)|3043612|中间码生成|3043613|代码优化(可选)|3043614|对于注释，应在词义分析阶段作为标记提取，在语法分析(分析)阶段删除。这样就可以减慢编译器的速度，但不能减缓生成的代码。|3043615|许多被解释的语言通常先执行两到三个阶段，然后才会执行，所以注释不一定会减慢甚至解释语言的速度。|3043616|entityMap^0|0|0|0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|S|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|T|8|@]|9|@]|A|$]]|$1|E|3|F|5|D|7|U|8|@]|9|@]|A|$]]|$1|G|3|H|5|D|7|V|8|@]|9|@]|A|$]]|$1|I|3|J|5|D|7|W|8|@]|9|@]|A|$]]|$1|K|3|L|5|D|7|X|8|@]|9|@]|A|$]]|$1|M|3|N|5|6|7|Y|8|@]|9|@]|A|$]]|$1|O|3|P|5|6|7|Z|8|@]|9|@]|A|$]]|$1|Q|3|-4|5|6|7|10|8|@]|9|@]|A|$]]]|R|$]]

When you compile the program, the compiler actually does:

<ul>
<li>Lexical Analysis (tokenization)</li>
<li>Syntax Analysis (parsing)</li>
<li>Semantic Analysis (language rules checked)</li>
<li>[Intermediate] Code Generation </li>
<li>Code Optimization (optional)</li>
</ul>

As for comments they should be extracted as tokens on Lexical Analysis stage and dropped out on Syntax Analysis (parsing) stage. So you can slow down the compiler, but not the code generated.

Many interpreted languages often do first two or three stages and only then execute, so comments don't necessarily slow down even interpreted languages.

blocks|key|3903748|text|编译器有以下几个阶段：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|3903749|词汇分析|unordered-list-item|3903750|句法分析|3903751|语义分析|3903752|生成机独立码|3903753|代码优化|3903754|生成最终代码|3903755|在词汇分析中，注释被跳过，基本上就像你什么也没写一样。|offset|length|style|BOLD|3903756|所以不，它们不会以任何方式影响性能。|3903757|entityMap^0|0|0|0|0|0|0|0|1|4|0|0^^$0|@$1|2|3|4|5|6|7|Y|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|Z|8|@]|9|@]|A|$]]|$1|E|3|F|5|D|7|10|8|@]|9|@]|A|$]]|$1|G|3|H|5|D|7|11|8|@]|9|@]|A|$]]|$1|I|3|J|5|D|7|12|8|@]|9|@]|A|$]]|$1|K|3|L|5|D|7|13|8|@]|9|@]|A|$]]|$1|M|3|N|5|D|7|14|8|@]|9|@]|A|$]]|$1|O|3|P|5|6|7|15|8|@$Q|16|R|17|S|T]]|9|@]|A|$]]|$1|U|3|V|5|6|7|18|8|@]|9|@]|A|$]]|$1|W|3|-4|5|6|7|19|8|@]|9|@]|A|$]]]|X|$]]

Compilers have these phases:

<ul>
<li>Lexical analysis</li>
<li>Syntax analysis</li>
<li>Semantic analysis</li>
<li>Generating machine independent code</li>
<li>Code optimization</li>
<li>Generating final code</li>
</ul>

In Lexical analysis, comments are skipped, it is basically like you didn't write anything. 

So no, they do not affect performance in any way.

blocks|key|3798842|text|注释将被排除在词汇分析阶段之外。|type|unstyled|depth|inlineStyleRanges|offset|length|style|BOLD|entityRanges|data|3798843|但是，如果在词法分析阶段解析带注释的代码，则可能需要更多时间进行比较，作为没有注释的代码进行比较，但注释不会影响执行时间|3798844|为什么你不自己尝试，看看下面的例子并运行它。|3798845|class+Program
{
++++static+void+Main(string[]+args)
++++{
++++++++DateTime+StartTime;
++++++++DateTime+EndTime;
++++++++TimeSpan+ExecutionTime;

++++++++StartTime+=+DateTime.Now;
++++++++for+(int+i+=+0;+i+<+10000;)
++++++++{
++++++++++++i%2B%2B;
++++++++++++for+(int+j+=+0;+j+<+100000;)
++++++++++++{
++++++++++++++++j%2B%2B;
++++++++++++}
++++++++}
++++++++EndTime+=+DateTime.Now;
++++++++ExecutionTime+=+(EndTime+-+StartTime);

++++++++Console.WriteLine("Phase+1+without+comment+done.");
++++++++Console.WriteLine("Phase+1+start+time+:+"+%2B+StartTime.ToString());
++++++++Console.WriteLine("Phase+1+end+time+:+"+%2B+EndTime.ToString());
++++++++Console.WriteLine("Phase+1+Execution+Seconds+:+"+%2B+ExecutionTime.TotalSeconds);

++++++++Console.WriteLine("\r\n---------------------------------------------\r\n");

++++++++StartTime+=+DateTime.Now;
++++++++for+(int+i+=+0;+i+<+10000;)
++++++++{
++++++++++++i%2B%2B;
++++++++++++for+(int+j+=+0;+j+<+100000;)
++++++++++++{
++++++++++++++++j%2B%2B;
++++++++++++++++//+SOME+COMMENT.
++++++++++++++++//+SOME+COMMENT.
++++++++++++++++//+SOME+COMMENT.
++++++++++++++++//+SOME+COMMENT.
++++++++++++++++//+SOME+COMMENT.
++++++++++++++++//+SOME+COMMENT.
++++++++++++++++//+SOME+COMMENT.
++++++++++++++++//+SOME+COMMENT.
++++++++++++++++//+SOME+COMMENT.
++++++++++++++++//+SOME+COMMENT.
++++++++++++++++//+SOME+COMMENT.
++++++++++++++++//+SOME+COMMENT.
++++++++++++++++//+SOME+COMMENT.
++++++++++++++++//+SOME+COMMENT.
++++++++++++++++//+SOME+COMMENT.
++++++++++++++++//+SOME+COMMENT.
++++++++++++++++//+SOME+COMMENT.
++++++++++++++++//+SOME+COMMENT.
++++++++++++++++//+SOME+COMMENT.
++++++++++++++++//+SOME+COMMENT.
++++++++++++++++//+SOME+COMMENT.
++++++++++++}
++++++++}
++++++++EndTime+=+DateTime.Now;
++++++++ExecutionTime+=+(EndTime+-+StartTime);

++++++++Console.WriteLine("Phase+2+with+comment+done.");
++++++++Console.WriteLine("Phase+2+start+time+:+"+%2B+StartTime.ToString());
++++++++Console.WriteLine("Phase+2+end+time+:+"+%2B+EndTime.ToString());
++++++++Console.WriteLine("Phase+2+Execution+Seconds+:+"+%2B+ExecutionTime.TotalSeconds);

++++++++Console.ReadKey();
++++}
}|code-block|syntax|javascript|3798846|entityMap^0|7|4|0|6|4|1E|A|0|0|0^^$0|@$1|2|3|4|5|6|7|Q|8|@$9|R|A|S|B|C]]|D|@]|E|$]]|$1|F|3|G|5|6|7|T|8|@$9|U|A|V|B|C]|$9|W|A|X|B|C]]|D|@]|E|$]]|$1|H|3|I|5|6|7|Y|8|@]|D|@]|E|$]]|$1|J|3|K|5|L|7|Z|8|@]|D|@]|E|$M|N]]|$1|O|3|-4|5|6|7|10|8|@]|D|@]|E|$]]]|P|$]]

Comment will be exclude from Lexical analysis phase 

but if code with comments are parsed in Lexical analysis phase it might be take more time compare as code without comments but comments does not affect execution time

Why are you not try by your self, look into below example and run it.

<pre><code>class Program
{
 static void Main(string[] args)
 {
 DateTime StartTime;
 DateTime EndTime;
 TimeSpan ExecutionTime;

 StartTime = DateTime.Now;
 for (int i = 0; i &lt; 10000;)
 {
 i++;
 for (int j = 0; j &lt; 100000;)
 {
 j++;
 }
 }
 EndTime = DateTime.Now;
 ExecutionTime = (EndTime - StartTime);

 Console.WriteLine("Phase 1 without comment done.");
 Console.WriteLine("Phase 1 start time : " + StartTime.ToString());
 Console.WriteLine("Phase 1 end time : " + EndTime.ToString());
 Console.WriteLine("Phase 1 Execution Seconds : " + ExecutionTime.TotalSeconds);

 Console.WriteLine("\r\n---------------------------------------------\r\n");

 StartTime = DateTime.Now;
 for (int i = 0; i &lt; 10000;)
 {
 i++;
 for (int j = 0; j &lt; 100000;)
 {
 j++;
 // SOME COMMENT.
 // SOME COMMENT.
 // SOME COMMENT.
 // SOME COMMENT.
 // SOME COMMENT.
 // SOME COMMENT.
 // SOME COMMENT.
 // SOME COMMENT.
 // SOME COMMENT.
 // SOME COMMENT.
 // SOME COMMENT.
 // SOME COMMENT.
 // SOME COMMENT.
 // SOME COMMENT.
 // SOME COMMENT.
 // SOME COMMENT.
 // SOME COMMENT.
 // SOME COMMENT.
 // SOME COMMENT.
 // SOME COMMENT.
 // SOME COMMENT.
 }
 }
 EndTime = DateTime.Now;
 ExecutionTime = (EndTime - StartTime);

 Console.WriteLine("Phase 2 with comment done.");
 Console.WriteLine("Phase 2 start time : " + StartTime.ToString());
 Console.WriteLine("Phase 2 end time : " + EndTime.ToString());
 Console.WriteLine("Phase 2 Execution Seconds : " + ExecutionTime.TotalSeconds);

 Console.ReadKey();
 }
}
</code></pre>

blocks|key|3798888|text|不，编译器不会减慢程序的速度，它会忽略所有注释并接受原始代码。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|3798889|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|D|8|@]|9|@]|A|$]]|$1|B|3|-4|5|6|7|E|8|@]|9|@]|A|$]]]|C|$]]

No the compiler does not slow down the program, it ignores all the comments and takes the raw code.

blocks|key|3043798|text|如果语言正在使用编译器，那么处理就不会受到影响，但是如果解释器在那里工作，则进程可能会由于注释而减慢。|type|unstyled|depth|inlineStyleRanges|offset|length|style|BOLD|entityRanges|data|3043799|entityMap^0|0|1F|0^^$0|@$1|2|3|4|5|6|7|H|8|@$9|I|A|J|B|C]]|D|@]|E|$]]|$1|F|3|-4|5|6|7|K|8|@]|D|@]|E|$]]]|G|$]]

If language is using the compiler then the processing don't effected but if interpreter is working there then the process may slow down due to comments.

This question has been asked several times here about interpreted language or R but I don't find anything about a compiled language, specifically C#.

According to what I read it seems to be negligible but it still induces a very little slowdown on interpreted language: 
<a href="https://stackoverflow.com/questions/2731022/do-comments-slow-down-an-interpreted-language">Do comments slow down an interpreted language?</a> 

What about compiled languages?! do they slow down only the compilation process but not execution?

Do comments slow down a compiled language?

翻译质量差，导致语言生硬或混乱。

没有提供实际的解决方法或示例。

解答不清晰，无法理解或解决问题。

页面排版不美观，阅读体验差。

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这个问题在这里已经问过几次了，关于解释语言或R，但是我没有发现任何关于编译语言的东西，特别是C#。根据我所读到的，它似乎可以忽略不计，但它仍然会导致解释语言的速度略有放缓：编译语言呢？！它们是否只减慢了编译过程，而没有执行？

问注释会减慢编译语言的速度吗？
EN

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问注释会减慢编译语言的速度吗？EN