Slowdowns with 8/29 Leaderpack update

So we're seeing reports that the LeaderPack update is associated with some players getting low fps in strategy and tactical. We're not sure what's causing it, so I'm starting this thread where people can report things like what troubleshooting steps they have taken and what mods they are running. Also, does it occur on new campaigns, or only existing ones? This will help us us to track down if it's a conflict with another mod.Finally, if you are getting this error, we'd appreciate it if you found your launch.log, typically here:\Documents\My Games\XCOM2\XComGame\Logsand emailed it to johnnylump(at)longwarstudios.com . Thanks!