It's a performance setting. You can disable it under [Settings > Performance > Precise Effects], but do know that it has a pretty large impact on performance the more stuff there is on the screen.
Tips for some people, You can kill the Dragon Early by mining the Stones around him, when he breaths fire just tap your Up/Down key rapidly, Only hit him at the back as he will block your attacks in the front, be sure you have a few Stamina items to last long enough the fight, Also dont stay at the top of the mountain too long as there's a yeti that spawns and drops Snow at you
I dont know if Damaging boars/Wyrms help in the Capturing part but it seemed to work for me so try that Somelame
i this game since it's like The Enchanted Cave 2, with you know Don't starve stuff... anyway i never thought combining those two things was i good idea, but apparently it was? so i have a question, what does greediness do?
Now Kupo, its ok if i get this character in the game but umm yeah here's my entry: 14,21,15,13,2,2,36,54,7,20,33,2 (Name: Marinata) (Age: 18) (where she might appear if added: Snowy area near the Boss(in the Boss Room i guess) (Dialogue: My Friend Told me to Clear out the Snowy Forest, Then i saw that Big (the Race of the Boss) come out of no where and Bashed me with its Arms, I wanted to get Back at it but You guys Already Cleared it, Thanks i guess (yeah if you do add this character you can add more dialogue)
 "The Dark One"){kind=icon}
 "Mine Blocks"){kind=icon}
 "Mutilate-a-Doll 2"){kind=icon}
 "Diamond Hollow II"){kind=icon}
 "Aground"){kind=icon}
 "Bit Heroes"){kind=icon}
 "Bit Blast"){kind=icon}
 "Rogue's Light - The Greedy Cave"){kind=icon}
 "EBF5 NPC Maker"){kind=icon}
 "Conquer Mars"){kind=icon}
 "Super Monday Night Combat"){kind=icon}
 "Swords and Souls"){kind=icon}
 "Mystic Guardians"){kind=icon}
 "Strike Force Heroes 3"){kind=icon}
 "Clicker Heroes"){kind=icon}
 "Epic Battle Fantasy 4"){kind=icon}
I've been getting more messages like this and it's making me feel old hahah! Thanks for popping back in and leaving a message :)