Casting lag fixed by being frozen?

So I was playing in the Faction event last night and noticed something a little strange. Usually when I cast hero weapons, there is an insane amount of lag, however, all of the hero weapons I currently use are maxed so I understand a little lag due to the extra effects some weapons have. After a few casts, the lag was getting very annoying. But, when the enemy froze my entire team, every cast since being frozen negated the lag effects from casting. Not sure if this is a weird bug or something but being frozen seemed to cure the lag from casting. Anyone else notice this or is casting lag just something we have to deal with?