Apache HttpClient api, reading response intput stream is very slow

Question

I am using Apache HttpClient. my code looks like this

            HttpClient httpClient = new DefaultHttpClient();
            HttpGet httpGet = new HttpGet(uri);
            HttpResponse response = httpClient.execute(httpGet);
            InputStream is = response.getEntity().getContent();
            File file = new File("filename.txt");
            FileOutputStream os = new FileOutputStream(file);
            IOUtils.copy(is,os);

This is going very slowly, like 13 seconds for a 400KB file. After some detailed debugging i found that I am only reading 8-10 bytes at a time from the inputstream. Apache IOUtils.copy already buffers with a buffer size of 4kb, is there any way to make this more performant as I am reading 200 files at a time and this performance is unacceptable. Thanks!!.