Too laggy to play with bees build

[benten]

So the situation only appears when I play Druid with bees build,
it seems if there’s too many minions, the game would become super laggy and keep flash back.
I’ve confirmed it’s not caused by my network or computer setup since other characters are just fine to play.
I hope this could be fixed, it’s such a pity can’t play with those bees ;_;