Flex 4: Using Ant to create a smaller file size like bin-release

I was trying to create an automation script for some of the projects in Adobe Flex 4 the other day and I realised that the ant build is generating a far more bigger swf file (in terms of the file size)than the ones created using bin-release. After numerous attempts, I finally managed to compress the file size to match the ones that that were generated using bin-release.

<!-- Within the <mxmlc> tag of your ant script, you need to 
 add the following. And take note of the comments below -->
<mxmlc>
 <static-link-runtime-shared-libraries>false</static-link-runtime-shared-libraries>

 <runtime-shared-library-path path-element="${FLEX_HOME}/frameworks/libs/textLayout.swc">
  <!-- If you are copying and pasting, do take note that 
   'textLayout_1.0.0.595.swz' isn't in the 'flex/' folder 
   but the 'tlf/' folder under 
   'http://fpdownload.adobe.com/pub/swz/' -->
  <url rsl-url="http://fpdownload.adobe.com/pub/swz/tlf/1.0.0.595/textLayout_1.0.0.595.swz" 
   policy-file-url="http://fpdownload.adobe.com/pub/swz/crossdomain.xml"/>
  <url rsl-url="textLayout_1.0.0.595.swz" policy-file-url="" />
 </runtime-shared-library-path>

 <!-- If you are copying and pasting, do take note that 
  'framework.swc' needs to be included before the other 'swz' 
  that belongs to the same 'flex/' folder under 
  'http://fpdownload.adobe.com/pub/swz/', otherwise errors
  will occur when you run the web application. -->
    <runtime-shared-library-path path-element="${FLEX_HOME}/frameworks/libs/framework.swc">
        <url rsl-url="http://fpdownload.adobe.com/pub/swz/flex/4.5.0.20967/framework_4.5.0.20967.swz" 
   policy-file-url="http://fpdownload.adobe.com/pub/swz/crossdomain.xml"/>
        <url rsl-url="framework_4.0.0.14159.swz" policy-file-url="" />
    </runtime-shared-library-path>

    <runtime-shared-library-path path-element="${FLEX_HOME}/frameworks/libs/spark.swc">
  <url rsl-url="http://fpdownload.adobe.com/pub/swz/flex/4.5.0.20967/spark_4.5.0.20967.swz" 
   policy-file-url="http://fpdownload.adobe.com/pub/swz/crossdomain.xml"/>
  <url rsl-url="spark_4.0.0.14159.swz" policy-file-url="" />
 </runtime-shared-library-path>

 <runtime-shared-library-path path-element="${FLEX_HOME}/frameworks/libs/sparkskins.swc">
  <url rsl-url="http://fpdownload.adobe.com/pub/swz/flex/4.5.0.20967/sparkskins_4.5.0.20967.swz" 
   policy-file-url="http://fpdownload.adobe.com/pub/swz/crossdomain.xml"/>
  <url rsl-url="sparkskins_4.0.0.14159.swz" policy-file-url="" />
 </runtime-shared-library-path>

 <runtime-shared-library-path path-element="${FLEX_HOME}/frameworks/libs/rpc.swc">
  <url rsl-url="http://fpdownload.adobe.com/pub/swz/flex/4.5.0.20967/rpc_4.5.0.20967.swz" 
   policy-file-url="http://fpdownload.adobe.com/pub/swz/crossdomain.xml"/>
  <url rsl-url="rpc_4.0.0.14159.swz" policy-file-url="" />
 </runtime-shared-library-path>

 <runtime-shared-library-path path-element="${FLEX_HOME}/frameworks/libs/charts.swc">
  <url rsl-url="http://fpdownload.adobe.com/pub/swz/flex/4.5.0.20967/charts_4.5.0.20967.swz" 
   policy-file-url="http://fpdownload.adobe.com/pub/swz/crossdomain.xml"/>
  <url rsl-url="charts_4.5.0.20967.swz" policy-file-url="" />
 </runtime-shared-library-path>

 <!-- If you are copying and pasting, do take note that 'mx.swc'
  isn't in the 'libs/' folder but the 'libs/mx/' folder under 
  '${FLEX_HOME}/frameworks/libs/'  -->
 <runtime-shared-library-path path-element="${FLEX_HOME}/frameworks/libs/mx/mx.swc">
  <url rsl-url="http://fpdownload.adobe.com/pub/swz/flex/4.5.0.20967/mx_4.5.0.20967.swz" 
   policy-file-url="http://fpdownload.adobe.com/pub/swz/crossdomain.xml"/>
  <url rsl-url="mx_4.5.0.20967.swz" policy-file-url="" />
 </runtime-shared-library-path>
</mxmlc>

* Click here for a great guide on creating the ant automation file for your flex 4 project.