Patching Flex 4.6 SDK chart functionality

After posting a comment on
https://sourceforge.net/adobe/flexsdk/wiki/Flex%204.6/
<https://sourceforge.net/adobe/flexsdk/wiki/Flex%204.6/> and being kindly
answered by Alex Harui, he directed me here to continue.

For a bunch of reason we are stuck on Flex SDK 4.6 for the forseeable
future.

The problem we want to fix is around chart functionality. We have
implemented some charts but they are incredibly slow to initialise (10 - 30
seconds).

I have seen this issue
https://issues.apache.org/jira/i#browse/FLEX-33216
<https://issues.apache.org/jira/i#browse/FLEX-33216> and was hoping to
apply the fix to our 4.6 SDK to see if it helps at all.

*What's the best way to do this?*

I was originally going to rebuild the Flex 4.6 SDK, retrofitting the
modifications. However, Alex suggested swapping the charts.swc lib file. I
have tried this (using 4.12 Apache SDK file) and although our main project
seems to compile our test project results in the following error:

[TestHealthRosterClient] No signed digest found in catalog.xml of the
library, C:\Workspaces\sdks\Flex\4.6.0\frameworks\libs\charts.swc. Compile
the library with -create-digest=true and try again.

We are using IntelliJ to build our product. The main project did build but
seemed to run equally slowly. However, I'm not entirely sure the modified
swc was picked up......