I can’t answer for Europe as a whole, because European police is not federalised or centralised in any way. There is a multilateral Europol.
My guess is that in countries with a recent history of war but now a more stable state (some Eastern European countries) you would probably get a quicker response.
In Western European countries, there would probably be a long response time. In Norway we have had two terrorist attacks for the last ten years (both by right wingers, one aimed at the Social Democratic Party youth convention and the second at a mosque), and in both cases police were too slow to respond.
This is based on nothing other than my gut feeling.
My guess is that in countries with a recent history of war but now a more stable state (some Eastern European countries) you would probably get a quicker response.
In Western European countries, there would probably be a long response time. In Norway we have had two terrorist attacks for the last ten years (both by right wingers, one aimed at the Social Democratic Party youth convention and the second at a mosque), and in both cases police were too slow to respond.
This is based on nothing other than my gut feeling.