Slow with direct action on mavericks 10.9.2

hello,

i have a empty erxapplication with only on direct action.
the direct action streams a large file.
the problem is that i only get about 120kB/s download speed.
does anybody have a solutions for this problem?
this problem does not exits perior to mavericks!






	public WOActionResults downloadAction() throws Exception {
		WOResponse aResponse = WOApplication.application 
().createResponseInContext(null);
		
		// contentTyp
		String contentType = "application/octet-string";
		String filepath = "large.tif";
		
		aResponse.setHeader(contentType, "Content-type");
		File f = new File(filepath);
		int bufferSize = 10000000;
		aResponse.setContentStream(new FileInputStream(f), bufferSize,  
(long) f.length());
		String fileName = NSPathUtilities.lastPathComponent( filepath );
		aResponse.setHeader("inline; filename="+fileName, "Content- 
disposition");
		return aResponse;
	}


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