what would be good for lightroom?

i want to get a new laptop to edit raw photos on for christmas. i've used my mom's M3 macbook air but since it doesn't have a fan, it thermal throttles like crazy and makes editing 36MP files feel like torture.

my current desktop has a ryzen 5 2600, 16GB of DDR4 and an RX 580. it's slightly better but still not good, plus i need something portable. my budget is around 300€, maybe i can stretch a little. screen size doesn't matter to me.