mobs disappear :S

when i make big lures and start using skills my mobs just get away from me...
is there any fix of this bug?

Yes, try lowering your graphics and make your mobs a bit slower.

can you tell me how to do that Con ?

click esc, options, make everything lowest, untick everything, make fullscreen mode, lowest resolution

to lower mob speed:
go to share/creature\monster.csv
go to RunSpeed column, or sumthin like that, and lower it