if I understood correctly you have 2 issues with the application 
1. slow time results from the route algorithm
2. the ETA (Estimated time of arrival) has bad results

1.
After 3 decades, the manufacturers of navigation products, have many 
different solutions, depending on the needs of the consumer. That's why *i 
have found*, it is better to use sygic or here wego for car navigation into 
the city and the osmand for 4x4 car navigation into the nature.

2. only the GOD knows the true ETA answer. The navigation software tries. 
How ... ??? i will say what i have learn
- collect in real time traffic data from data servers using internet access
- using statistics when we navigate from our device
- No3 but very important, the map data has integrated traffic data. If we 
have one map provider like HERE or tomtom, we have very good results. But 
what about the free osm map provider ????

i hope those personal answers to help you

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