What are the " usual troubleshoots " you've tried @clockley
Splitting the frequencies in your Home Broadband Router.
What's the speeds like with other sources of Wi-Fi although I do find public Wi-Fi to be typically slow and not secure.
Perhaps try a family or friends Home Hub.
Daily Driver > Samsung Galaxy s²² Ultra 256Gb in Phantom Black.
The advice I offer is my own and does not represent Samsung’s position.
I'm here to help.
I have the same issue with my A53. Other wireless devices all get around 400-800 mbps (1000 mbps wired internet) and the A53 gets around 20 to 50 mbps max.
Using a brand new TP-Link Deco XE75 set.
Did you find a solution for it yet?