Mine with two sim had embarrassingly slow data speeds, both 4 or 5g,
and if i remember have a lot of battery drain too.
My only option here is to use it with only one sim.
I feel ashamed cause at the moment I understood that the sim is the problem i had already call my provider 2-3 times asking for looking my data connection.
without e-sim, but with 2 sim instead.
but if you use both the phone is unusable.