Maxing a tree bonuses for other countries

I am new to WT and am slowing working my way through the tank trees. UP until this point I was playing each country and slowly leveling them up. Would it be better to max out a tree first? I think I read somewhere that there is then some sort of bonus for your other nations but I can’t recall where I read that at.

For example: Should I concentrate on one nation and get it to top tier to then get some sort of bonus to catch the other countries up or should I just work on them all together.

Thanks in advance for your guidance, I appreciate helping me figure this out.

Depends on what your goal is while playing :)
Is your goal just to play every nation and have fun or is the goal to get to the end of every tree? (secondary question, what is your goal when everything is unlocked?)

This is correct, you can read about the bonus and how it works here: (Following the Roadmap: Vehicle Research Bonuses).
But TLDR:
Once you have unlocked a top vehicle (indicated by an arrow after the vehicle that points to the bonus information below it in the tech tree) all other nations you play get a bonus to RP for the first 5 games every day (this applies to trees of the same vehicle type; Air - Ground - Sea, so getting to the top in an air-tree only gives the bonus in all other air trees but not the ground ones). The bonus size is rank dependant.

So given your play style of playing every nation mixed it might be well worth it to focus on only one for a while to get to the top of one tree if you really want that bonus (A small tip here is to then choose one of the smaller trees for this to make it faster to get to the top, Japan for Air trees for example). But if you don’t like that type of playing then perhaps it might not be worth playing while not having fun just for a bonus, so ultimately a personal choice.

Hope this helps ^^

This helps completely. Thank you very much for the information. Now I understand how it works.

Again, thank you!

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