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You might have found that old school routers or lower tier model from each brand doesn't have load control. So unless its on max setting, you'll find it bogs and then stalls (or at least slows enough your chip size grows out of control and it trashes your work).
Anything over 1200w with load control from a decent brand is gonna be ok. Festool, dewalt and blue bosch are the usual suspects
What’s the best 240v 1/2” router? The classic Makita one I’ve been borrowing / using is a piece of shit in terms of adjustment and depth setting, it’s also slowing falling to bits. I am brand agnostic.