Sorry for the delay in my response. Other priorities popped up.

Quote Originally Posted by Butters View Post
Series 2 nuvi devices should boot up in about 10-15 seconds. Some devices will perform better if there is a detail map on the device, even a tiny one. Just a few tiles of an OSM not already covered by your SD's map might be enough to get it to boot faster.
Placed a 5 kb size unlocked detailed map on the device. Made no difference. Also not when removing the SD card containing the other detailed map.

Quote Originally Posted by osiris4isis View Post
Try checking for any bad memory blocks in diagnostic screen (press battery icon for more than 8 secs)
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It appears RAM and ROM are both fine.

I am inclined to think the data in a particular rgn may be corrupt. After all, it takes 50 seconds until map data is being loaded. What is the device doing all that time? Probably reading rgn's. As mentioned, once the device is up and running, its operation is without any flaws or delays.