I'm pretty sure that changing between two online map sources was faster before version 2.
Tapatalk@CyanogenMod@HTCVision
I'm pretty sure, I didn't change system in this case. Speed of change depend on speed of memory where are maps stored. So on some slow SD card, it will take some time. On my Nexus on internal memory, it's almost immediately.
And why it takes some time? It's because Locus is storing downloaded data to database and then closing this SQLite database. There is no space to speed up this process ... tiles have to be stored and database closed. On second side, I don't this it's a huge problem (if this is within let's say 5 secs, which I hope it is ...)