Keepalive timeout issue. Fixed when i removed Citizens (Free version)

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The problem is that players trying to join cant because of "Keepalive timeout". I´ve just removed the Citizens jar file and now everything works smoothly.
Server Log not relevant (Timeout on Entry to the server, solved when removed from it). Citizen config not touched, its default from stock. -Paper version git-Paper-384 (MC: 1.15.2) (Implementing API version 1.15.2-R0.1-SNAPSHOT) // Citizens2.0.26 b1997 Free version
FOR LAG RELATED ISSUES: 5GB RAM - 25 NPC´s - https://timings.aikar.co/?id=880d0129dada4800a42c46ce2f84f05e#

CitizensDev / Citizens2