Quickest way to read text-file line by line in Java

Question

For log processing my application needs to read text files line by line. First I used the function readLine() of BufferedReader but I read on the internet that BufferedReader is slow when reading files.
Afterwards I tried to use FileInputStream together with a FileChannel and MappedByteBuffer but in this case there's no function similar to readLine() so I search my text for a line-break and process it:

    try {
        FileInputStream f = new FileInputStream(file);
        FileChannel ch = f.getChannel( );
        MappedByteBuffer mb = ch.map(FileChannel.MapMode.READ_ONLY, 0L, ch.size());
        byte[] bytes = new byte[1024];
        int i = 0;
        while (mb.hasRemaining()) {
            byte get = mb.get();
            if(get == '\n') {
                if(ra.run(new String(bytes)))
                    cnt++;
                for(int j = 0; j<=i; j++)
                    bytes[j] = 0;
                i = 0;
            }
            else
                bytes[i++] = get;
        }
    } catch(Exception ex) {
        ex.printStackTrace();
    }

I know this is probably not a good way to implement it but when I just read the text-file in bytes it is 3 times faster then using BufferedReader but calling new String(bytes) creates a new String and makes the program even slower then when using a BufferedReader.
So I wanted to ask what is the fastest way to read a text-file line by line? Some say BufferedReader is the only solution to this problem.

P.S.: ra is an instance of RunAutomaton from the dk.brics.Automaton library.

Answer 1

Using plain BufferedReader I got 100+ MB/s. It is highly likely that the speed you can read the data from disk is your bottle neck, so how you do the reading won't make much difference.

BufferedReader is not the only solution, but it is fast enough for 99% of use cases, so why make things more complicated than they need to be?