I've submitted my application on Tuesday, yesterday it was received by the UKVI and today it says that a Decision was made. Is that too fast? does this necessarily imply refusal? It is worth mentioning that I've paid extra for 5 business days process but still 2 days seems fast, so what do you guys think? should I be prepared to receive a refusal or is that irrelevant?
It doesn’t mean anything other than the fact that your application was straightforward and decision was relatively easier to make.
You paid for Priority services and they did exactly what they claim about the service
If you need your visa in a hurry, you can use UK Visas and Immigration’s Priority Visa service for your visit, work or study application.
This will put your application at the front of the queue at every stage of the decision-making process.
They have done a good job! Unfortunately even the clerk who returns your passport to you will not have a clue about the actual decision until the package is opened.