Particlesystem looks bad in runtime

I’m leaving the particlesystem editor on, while normally it looks like that:
When I start to play, looking at the same particlesystem, it looks like that:

And of course in the game itself it looks bad, is it a bug? I’m using 4.9.1 and I think I had the issue in 4.8.3 as well.

*The game is on the highest scalability settings.

It is perhaps some texture resolution or texture filter problem.
Do yo urun your game on 100% resolution ?

Yep! Everything is on max.

Ok I’v solved it, I had to set the texture that is used for the fireball’s particle to nomipmaps in the texture editing window.