When I summon DragonFireballs and give them custom direction, they're moving laggy, however when I add execution of particles on them, the particles are moving equally.

When I summon moving DF:
/summon DragonFireball ~ ~-1 ~

Or idle and then move it:
/summon DragonFireball ~ ~-1 ~

/entitydata @e[type=DragonFireball]

And when I summon one of the above and add particles:
/execute @e[type=DragonFireball] ~ ~ ~ /particle dragonbreath ~ ~ ~ 0 0 0 0.01 1 force

(The last command is executing repeatedly)

But only DragonFireballs lag. Other projectiles are moving perfectly.