[BUG] Memory leak

[Heriptik]

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• If you are running the plugin at first time, try to run again to see if the problem persists.
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Describe the bug Hi, i use rankupper plugin since 1 year, and i have a memory leak. I must have 100 players connected simultaneously and i see that in the timings that rankupper takes all the processors. I have contacted spongeforge developper and they advised me to come back to you for memory leaks

To Reproduce Steps to reproduce the behavior: Just install RU in your server and play

Expected behavior Memory leaks appear after several hours of server openings

Screenshots and LOGs I don't have error in my console.

Server and plugins versions (please complete the following information):

• Server: [SpongeForge 1.12.2-2838-7.3.0 (last recommanded version)]
• Plugin Version: [RankUpper-4.0.5-b28-Universal.jar]
• Java Version: [Java 1.8]

Additional context Screen timings : [screen](https://image.noelshack.com/fichiers/2020/44/2/1603769851-ru-bug.png Timings : timings Config : config

thanks for your help