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If you're choosing Follow Course and use a GPX or TCX the Garmin has to route it over the maps it has installed. It can't give you TBT if it doesn't have a map installed with corners, can it?
Maybe it appears instant but my 400k audax route on the weekend spent a good 30 seconds+ "calculating", even if the Always Display meant that my bright green line was visible. Once it has finished calculating the course, you can't really see the Always Display green line, it is covered by the standard PINK Garmin navigation line.
Touring Edge - I have no idea about this model so none of what I'm saying may apply.
hippy-
I think @hamrack has it right above - Touring model has no "always display" setting, so we're probably talking about the same idea, but the implementation is totally different for our different models.
Whatever length route (admittedly I've only loaded up to 180km) you don't see any "calculating" screen - it just instantly shows the line. Touring doesn't have a "follow course" bit either - just press "where to" > "saved" > "courses" & select what you want.
So what I'm oh so helpfully saying is: I think its possible, but no idea how to do it on your unit.
Brookly_Bay
huh, I was under the impression that's what my method was doing - it instantly brings up the line on the map (rather than doing that "calculating" thing) when I load the map and it just looks like its overlaid the line I drew on ridewithgps on top of the map. Fairly sure it's not doing any of its own routing at all.*
I am on a Touring Edge though, so this stuff might be different on higher end models.
I have all that "recalculation" stuff turned off as well, so there's no funny business if I go off course (learned the hard way on this!).
*of course, being garmin, you're never entirely sure what is going on.