InputStream in = new FileInputStream(file);int q;while ((q = in.read()) != -1) { ...}The code above reads a file byte by byte. Every read() method call on the stream causes a native call to native implementation of the filesystem. Depending on the implementation this may cause a syscall to the operating system. The number of native calls can be reduced significantly by wrapping the stream into a BufferedInputStream:
InputStream in = new BufferedInputStream(new FileInputStream(file));
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