Proper and good Multithreading
Highly optimized Chunks, chunk ticking
Optimized redstone with eigencraft-redstone moved from newer viersions and other optimizations, limit for how many redstone operations can happen one chunk to prevent lag machines
Very optimized entities and mobs, and entity ticking
Disabled leaf decay (with toggle)
Dropped item optimizations
Hopper optimizations
Alt-item-despawn-rate added from newest paper versions
Option to disable lava and water making cobblestone
Knockback settings (with update command), optimized pvp, hits, kb etc
Optimized networking and ability to hold a lot of players without lag
Armor equipping event https://pastebin.com/tdw8nDx7
Option to disable pistons breaking melons and pumpkins
More useful /tps output, better data and more accurate
Optimized Packet Processing possibly multithreaded?
Minecraft::world - Scheduled Blocks optimization
Optimized Minecraft::Bukkit Scheduler
Mob collisions fully disabled
Tacospigot optimizations
Optimized player move event
Netty optimizations
Thread Affinity
Multithreaded worlds
Option to increase displayname length, make it like 40 by default
Paper spigot distributed mob spawns moved from latest paper versions https://github.com/PaperMC/Paper/pull/2171
All other optimizations from your old spigots
Better utilization of cpu
Make server process higher priority, i think this is called thread pinning?
Don’t track entities outside the tracking range of the player, similarly to this plugin:
https://www.spigotmc.org/resources/entitytrackerfixer-fix-1-14-4-entitytick-lag.70902/
https://github.com/Esmorall/EntityTrackerFixer
If this isnt a issue in 1.12.2 ignore it and let me know ^