Hi Minko,

well, yes, the problem is caused by an extreme density of (Garmin) route restrictions. Those are created for OSM turn restrictions and also for barriers when --link-pois-to-ways is used. Maybe this area contains many type=restriction relations with via ways, those require more bytes compared to simple turn restrictions with one via node.
I think the fix in r4805 is the better alternative compared to using --ignore-turn-restrictions.

Gerd