The size of memory doesn't affect the time to load, but does affect the max size of samples in total you can load.
It's the size of the samples (user created) which does determin how much time it takes to load. Ofcouse with a bigger memory you are tempted to load even more samples and as such, more time is taken up loading these. If you have a larger memory but still load the same number of samples as when you had a smaller memory, the time to load remains the same!

Now ofcourse with a battery backed 1GB RAM (when applicable), you might look at an initial (first time) loading time of 15 minutes to occupy the entire RAM, but once loaed, the next time you turn on the AUDYA, you will only need about 45 seconds (as is standard now with no samples being loaded).

As TWD explained above, the technology used in AUDYA is slightly different from other manufactures and so the specifications do not tell the same story. This is why (for an example) the SD1 (which only has 64 note polyphony) sounds richer than other keyboards produced at that time with 128! Different way in which sound is manipulated and handled. This same theory applies to the specifications on Powered speakers today ... you as the end user (unfortunately) need to go through to find out what is needed ... for you! 1000W on a JBL might not 'feel' or 'sound' the same as 1000W on QSC (how far is the speaker from the measuring device? What was the temp./pressure of the air in the room when measured by each manufacturer ... etc (as an example) )!