Ballistas dropping ms

Using siege ballista and when i not summon totems, ms stable. But when i start place, suddenly starting dropped. i check my cpu gpu how is react, there is nothing wrong. Please check this, it might be also i suspecious about maybe effecting some couple maps only. But i really geting bad experience about it. my network stable,gpu cpu stable, untill i summon totems. Please control this issue, thank you.

You tell me. As a ballista totem enjoyer I've pretty much given up on having a smooth experience. Totally worth it though.