So I was using lag goggles to try and find the source of some lag I was experiencing while testing a large'ish modpack. After profiling, it claimed that RealisticItemDrops was eating up the most resources. I was testing in singleplayer in a newly generated world, so it's likely there were some random items laying about from worldgen breaking leaves and plants, but it still seemed odd. So I went ahead and disabled RID temporarily and restarted. Sure enough, the reported resource usage disappeared. I'm using all default settings in RealisticItemDrops, except I enabled Auto Pickup. Could auto pickup be spamming checking if players are nearby or something?

Edit: Forgot some info you might want.
MC 1.12.2
forge-14.23.5.2847
RealisticItemDrops-1.2.14.jar

I can support this with a screenshot of such in a rather decently large pack also:

(yeah, I might be having some issues entity wise)