If I am pulling DCI's from 100's devices every minute, is there a way to scatter the collections so I don't have the network traffic for 100's device all at once? I work in an environment where bursts of traffic can be an issue.
You can try using Custom schedule and specifying exact seconds for various DCIs: https://www.netxms.org/documentation/adminguide/appendix.html#cron-format
Other possible approach could be network traffic throttling: https://man7.org/linux/man-pages/man8/tc-tbf.8.html