Herald of Ice and Glacial Hammer

Hey together,

i have a question to herald of ice in combination with glacial hammer. Sometimes it happens that my entire screen freezes because of lags. Mostly when i played blight and there are a lot of monsters in one place.
Now i just want to know what exactly happens, because something similar happened during mapping.
The reason why its laggy is because i have a ton of herald of ice explosions and i might be because of glacial hammer, but im not sure.
Glacial hammer describes that enemies shatter, when they are under 1/3 life and will be frozen. This could cause the herald of ice explosions. But i noticed that there are herald of ice explosion on living enemies in a huge frequency (could be my attack speed). And this causes my game to be laggy and freeze sometimes.

Can anyone explain this? Where these huge amounts of explosions come from?

Blight seems to be one of the most draining things for performance in the game. My rig is getting pretty old but on my current build which is vaal smite it seems to run everything, but gets a little bit tested on blighted maps. A few leagues back I was playing venom gyre with stacks of projectiles and that was more draining, I couldn't do blight maps at all. I think it's just the amount of calculation. I'm not that familiar with using herald of ice, but I think it can have a cascading effect where by the explosions themselves cause more shatters and create more explosions in a chain reaction?

Yes could be possible. I also recognized that large group of monsters with proximity shields cause that lags.
Since 1-2 leagues i couldnt do any ravaged blighted maps because of the lags.