CheckTLFFontsLoaded taking large amount of time every frame

After trying to figure out why converting all our text fields to TLF is hammering performance for ages, I've finally discovered the culprit function that is taking so long on every single frame:
RuntimeManager$.checkTLFFontsLoaded (fl.text)
This function often spends more than 10 ms running each frame, and is by far the longest running function in our application's action script every single frame.
Can anyone give me a rough idea of what calls this function so I know what to start looking for in my code?
I posted this question on the TLF forums but was told to come here because fl.text.RuntimeManager is a class of Flash Pro not TLF.

fl.text.RuntimeManager is not a class of TLF but Flash Pro. Here we mainly focus on TLF, which includes classes in textLayout.swc. So you may want to duplicate your question to http://forums.adobe.com/community/flash. Thanks!

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Hi cowboyincognito,
Thanks for visiting Apple Support Communities.
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Hello~ Chrisrob94
My computer environment is
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Hello,
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CheckTLFFontsLoaded taking large amount of time every frame

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