the 90k connections should be no problem for litespeed to handle, but it may hit some hardware / OS limit for example NIC throughput.
assume all 90K connections are downloading large videos, for 10Gbit NIC, each connection will get max 11 bytes/second speed ? this speed won't be able to view video smoothly.
anyway, 90k connections looks a huge number. maybe have to prepare a few servers to serve smoothly.