1.14.4 server lag with only one player online

Hello, I run a private survival server to play with friends. The performance hasn’t been great, even with just 1-2 players online. Already tried optimising the spigot.yml and paper.yml settings but no luck so far. It’d be great if you guys could help me out here.

Timings: https://timings.aikar.co/?id=b956b2e3102d49e28f0876ef56a3d633

Plugins: AuthMe, ClearLag, DiscordSRV, EntityTrackerFixer, FastLogin, ProtocolLib*, VillagerOptimiser

Startup script:
java -Xms9G -Xmx9G -XX:+UseG1GC -XX:+UnlockExperimentalVMOptions -XX:MaxGCPauseMillis=100 -XX:+DisableExplicitGC -XX:TargetSurvivorRatio=90 -XX:G1NewSizePercent=50 -XX:G1MaxNewSizePercent=80 -XX:G1MixedGCLiveThresholdPercent=35 -XX:+AlwaysPreTouch -XX:+ParallelRefProcEnabled -Dusing.aikars.flags=mcflags.emc.gs -jar paperclip.jar

Computer specs:
Samsung SSD 850 PRO 256GB
32.0 GB DDR3 RAM
Intel Core i7-4790 @3.60GHz

Thanks in advance!