Mincraft lags after firework rocket is shot out of range

I used floating water to shoot a firework rocket [Duration:3, White, Trails] sideways. Explosions were not rendered because they were going out of the render distance [far]

To check where they fly and explode i builded a 4 seconds timer, then i went towards the explosion, after a few seconds the fps went to 0.

When i quit to main menue i heared the explosions and the game was normal until suddenly the fps drops again.