Huge TPS Drop because of mobs?

Heyo, recently our server has been struggling tps wise, and we dont really know where to even start looking. We are guessing because of mobs because of a spark report? Here is a report a admin grabbed during a decently bad time: https://spark.lucko.me/u4uRsyQlhu
spark is a performance profiler for Minecraft clients, servers, and proxies.
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