Operating system: win10 74bit
Broken: 2.8, 2.79b
Short description of error
"Children" option works good only with "Along path". Otherwise it just duplicates extra geometry where parent particles are located.
Exact steps for others to reproduce the error
Open file and enable "Children" option, see how poly count is changed without visual appearance. Then check both "Children" and "Along Path" to see the difference.