poeNullParticles (download) - program. Creates null particle files for Path of Exile.

HowTo:

1. Export particle files from Content.ggpk using VisualGGPK. Atm it's "Metadata" folder.
2. Put poeNullParticles app near "Metadata" folder.
3. Launch once, wait "End" message.

Or

1-3. download the latest null particle files for Path of Exile here
Version: 3.1.0
Warning: It removes all particles from the game. Don't forget to make backup (i.e. copy .ggpk) if you want.

Then

4. Import created "nullParticles\Metadata" folder into Content.ggpk using VisualGGPK (just drag'n'drop "Metadata" folder).

Sources:
Open github page.

VisualGGPK:
https://github.com/MuxaJIbI4/libggpk - sources.
https://yadi.sk/d/obOymoCcjhQ6f - compiled.