Diego Grimaldi

I couldn't open your scene, but remember that particles are born with an ID attribute that you can use to generate your sparks.

I'd suggest to use a high substep to create lot of particles and connect them with an add sop running over ID attrib.

Good luck

Unless the object is HiRes, which you are saying is not, the alembic should not be a problem at all.
The problem might be the Voxel size inside DOP or in your fluid source which gets created automatically from the shelf tool.
Make sure those are not too extremely hi-res and you should be good to go.

If you are still running into problem, post a hip file with a locked node and we can help you out more.

Good luck!

Sounds like you may have some conflict issues with the NAME attrib.

It might be easier to debug if you post a scene file.