Developer Libraries » IOCipher

An Android app I am building is having performance issues.
An attachment shows performance test results. For example writing a 10 meg file on the standard Android filesystem takes 547 ms. The same operation on IOCipher requires 19780 ms.

Given SQLCipher is under the hood, what tuning can I do to improve performance?
For example, copy file uses a 1024 byte buffer. Can the size be changed to match the record size used in SQLCIpher?

public static void copyFile(InputStream in, OutputStream out) throws IOException {
        byte[] buffer = new byte[1024];
        int read;
        while((read = in.read(buffer)) != -1){
            out.write(buffer, 0, read);
        }
        in.close();
        out.close();
    }

Better yet, what is the fastest way to duplicate an IOCipher file? The copy file algorithm shown when used to duplicate a file requires 599 ms on a standard Android filesystem and 25851 on IOCipher.

Thanks in advance for any tips or suggestions.