title: Compression library for Java
body: <p>I know that this question has been asked many times, but I still can't get my problem solved.</p>
  
  <p>I am trying to compress 3 jpegs(about 500~700kb each) and a audio file(pcm 1.5mb).</p>
  
  <p>I've tried Java.util.zip, zip4j and I get like 2% compression even in the maximum compression setting. I will need at lease 30~40% compression.</p>
  
  <p>Is this a impossible thing to do?</p>
  
  <p>The reason I am trying to compress data is my server's throughput is limited and I would like to get maximum speed. It takes about 6~8 seconds for 3.5mb zip... My goal is to get about 1~2second.</p>