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copied!<p>Use a background worker and read only a limited number of lines. Read more only when the user scrolls.</p> <p>And try to never use ReadToEnd(). It's one of the functions that you think "why did they make it?"; it's a <a href="https://en.wikipedia.org/wiki/Script_kiddie" rel="nofollow noreferrer">script kiddies'</a> helper that goes fine with small things, but as you see, it sucks for large files...</p> <p>Those guys telling you to use StringBuilder need to read the MSDN more often:</p> <p><em>Performance Considerations<br /> The Concat and AppendFormat methods both concatenate new data to an existing String or StringBuilder object. A String object concatenation operation always creates a new object from the existing string and the new data. A StringBuilder object maintains a buffer to accommodate the concatenation of new data. New data is appended to the end of the buffer if room is available; otherwise, a new, larger buffer is allocated, data from the original buffer is copied to the new buffer, then the new data is appended to the new buffer. The performance of a concatenation operation for a String or StringBuilder object depends on how often a memory allocation occurs. <br /> A String concatenation operation always allocates memory, whereas a StringBuilder concatenation operation only allocates memory if the StringBuilder object buffer is too small to accommodate the new data. Consequently, the String class is preferable for a concatenation operation if a fixed number of String objects are concatenated. In that case, the individual concatenation operations might even be combined into a single operation by the compiler. A StringBuilder object is preferable for a concatenation operation if an arbitrary number of strings are concatenated; for example, if a loop concatenates a random number of strings of user input.</em></p> <p>That means <strong>huge</strong> allocation of memory, what becomes large use of swap files system, that simulates sections of your hard disk drive to act like the RAM memory, but a hard disk drive is very slow.</p> <p>The StringBuilder option looks fine for who use the system as a mono-user, but when you have two or more users reading large files at the same time, you have a problem.</p>

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