Reading from internal memory

What would the diff be (in terms of speed)between filling up the internal memory on a 8 gb Fuze,or having an external 8gb card full?Is there a big lag?Also assuming the 8gb card is a class 6.

There was a recent thread where a few people posted read & write speeds on internal vs flash. With a good flash card, the external flash can be a good bit faster. The internal flash really isn’t particularly speedy.