Adding this is case someone has the issue, I upgrader to forwarder to 9.4.4, not 10 but reading this sounds the same. The forwarder ran as system before now runs as local account SplunkForwarder, SplunkForwarder is part of everyone, Our ad audit policy rules had some with everyone on read of anything. this rule caused the security log to log 100k 4662 of splunkforwarder reading an object, that looped upon itself. This caused security events not to forward at times. Reset the forwarder fixed but only for a while. My fix was to change the AD audit policy to be for domain users not everyone. My security events now are loaded timely. To see if this is your issues look in security logs for 4662, by account running the forwarder, if you see thousands of events in a few seconds now and then, this was how I found my issue. Below someone posted to disable lookup which works but wasn't the solution for us because we delete and recreate computer objects all day. Hope this helps someone as it took me awhile to find our issue.
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