For the first time in my life, I decided to ride the Russian route, and what I saw made me sad, to put it mildly.
I opened the route in the editor and found that one layer of vegetation was blocked, apparently due to too much density of trees.

I cloned the route, unblocked this layer, and removed from 50 to 80% of several tree species located too close to each other through massive object replacement.
Then I saved it as a new route and after cloned all the sessions, unlocked all the layers in them, opened the session folders in CM for editing and copied all sessions folders to another location.
In the config file of each session, in map-kuid and in kuid-table replaced original route kuid with kuid new cloned route and imported all sessions folders it into CM.
It turned out to be an updated route with sessions, and my ten-year-old hardware is doing a great job with it. It all took me a little over one hour.
Below are the screenshots, where the first is the original, the second is the cloned one route:








I opened the route in the editor and found that one layer of vegetation was blocked, apparently due to too much density of trees.

I cloned the route, unblocked this layer, and removed from 50 to 80% of several tree species located too close to each other through massive object replacement.
Then I saved it as a new route and after cloned all the sessions, unlocked all the layers in them, opened the session folders in CM for editing and copied all sessions folders to another location.
In the config file of each session, in map-kuid and in kuid-table replaced original route kuid with kuid new cloned route and imported all sessions folders it into CM.
It turned out to be an updated route with sessions, and my ten-year-old hardware is doing a great job with it. It all took me a little over one hour.
Below are the screenshots, where the first is the original, the second is the cloned one route:








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