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I am currently writing a program in C++ which includes reading lots of large text files. Each has around 400.000 lines with in extreme cases 4000 or more characters per line. Just for testing, I read one of the files using ifstream and an implementation I found on cplusplus.com . On my machine, it took around 60 seconds, which is quite long considering my workflow. Is there a straightforward way to improve reading speed? The code I am using is more or less this: string tmpString; ifstream txtFile(path); if(txtFile.is_open()) { while(txtFile.good()) { m_numLines++; getline(txtFile, tmpString); } txtFile.close(); } Notes: The file I read is only ~80 MB big. I mentioned the maximum charcount of 4000 per line because I thought it might be necessary to know in order to do buffering I have to use readline , since I need to count the number of lines Instantiating the ifstream as binary didn't make reading any faster Parallelizing the task will speed it up, but isn't straight-forward and has a good chance of introducing bugs After lots of back and forth discussion, a big thank you to sehe for putting so much time into this, I appreciate it a lot!

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