I agree with the GL. If we had sense using the samsung GL drivers properly there would NOT be a slow down. of course I don't have the skills to write a driver, nor a wrapper for a driver.
I'm pretty sure its the lack of the proper GL drivers that make it laggy and not the RAM at all.
boosting the clock adds a few frames a sec which helps a bit ( as I am using Ninjas v1 @1Ghz) and runs real well. But with the proper GL drivers this would not be needed.
I could be wrong but seems GL is the missing link.
Or enough time for that matter.