Will a larger (higher capacity) chip cause a handheld to scroll more slowly?

I have a Garmin GPSmap 76 Cx. I recently swapped the Topo map for the Inland Lakes map. The old map was on a 1 gig chip. The new one is on a 16 gig chip.
I loaded only the maps for Missouri and surrounding states. I noticed that scrolling in noticably slower with the new map/chip. Could that be a result of the unit having to scan a higher capacity chip... even though the file sizes are similar? If so, I'll get a smaller capacity chip and reload the maps? (Both maps were loaded to the microchip using the CD and Mapsource)

Does the larger chip have a lower speed class rating?

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Originally Posted by Corker

Does the larger chip have a lower speed class rating?

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No, the newer (bigger) chip is a class 10.

Probably because then new map has more detail. Look at the file size of each map.