Read XDA forums, this is a very comprehensive discussion by the developers of these fixes. I have been using them with no problems. However, some of the custom ROMS conlict with the lagfix's depending on which version you are running. [Lag Fix] The NEW Lagfix Thread! (IT WORKS) - xda-developers.
I don't know where you read about the lagix's but the developers do list the risks of using them. I hope this helps.
You can always flash back to stock using Odin and start over. [STOCK ROM] Odin3 One-Click Downloader and Drivers - xda-developers
I hope this helps.
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