Flickering light of particles.

Good day, dear Sirs!

Moved frome 4.15 to 4.16, everything fine except this.…nd=1&module=im…d55f4c4e6c3d7f

This is from Infinity blade particles.

Tried different channels, and bounds, also inversion of light source.
If i select 10-12 of this particles it goes for “ok”, and when i disable dynamic shadows it’s the same.
Also at 4.15 there wasn’t any impact to 8 of those in screen, on reflecting floor, now it goes from 60 to 20 fps at the moment. Please help! What can we do?

Thank you!