Poland to Swede
Actually Poland and Sweden's nominal GDP is roughly the same at $500 bil a year. However, like most western and Scandinavian countries their growth is sluggish at right around 1% while Poland's is right where it should be at 4.6%. That's a perfect level because if it was too high we'd then have to worry about rising inflation.
no existence of "No Go Zones"
That's what's saving Poland right now. Notice that the Ukranians, despite their numbers exceeding 1 million, did NOT establish neighborhoods that have far higher rates of crime, unemployment, terrorism, rapes, poverty, etc. The same cannot be said of the migrants that settled in W. Europe, Sweden, etc. Just recently there were reports all over media outlets of two girls being assaulted. Although this happens daily in Sweden, the circumstances of these attacks is what caused them to make headlines. In one case a 19 year old was brutally attacked because she pushed a guy away after he put his hand up her skirt. The man didn't take kindly to that and smashed a bottle on her face scarring her for life. In the other incident, a group of men gang raped a 17 year old and set her vagina on fire using lighter fluid once they were done.
It's not that Poland can't take in any migrants - they just have to carefully vet and scrutinize everyone they let in. There's tons of people from all over the world that are peaceful, law abiding residents. Germany, France, Sweden, etc. took in hordes of people, mostly young men with no wives/families and no valuable skills from an entirely different culture without vetting them and even worse provided them housing, food, money, etc giving them zero incentive to get a job. Why would you if the money you're getting for free from the government is far more than what you would've made back home? On top of it, the police especially in Germany and Sweden constantly catch the same people doing the same kind of crimes like pickpocketing, assault, sexual assault, etc and they merely book them and release them the very next day. A German cop that was interviewed stated that he'll often arrest the same people 30 40 times but they can't be put in jail unless they commit a murder or something (in which case they'd likely just go to another European country to avoid getting caught) because the prosecutors' simply don't want to prosecute them. The German and Swedish government are purposely censoring statistics and even rape survivors so as not to incite more tensions against the migrants.