The server is linux The stable version of Minecraft 12.2 works without any performance issues at all.
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This is not a legitimate response. This is an unmodified version of Minecraft running on a server I control.

I'm not sure why @unknown thinks your game is modded. However, this still is an issue on your end: you ran out of memory, and I see it specified that you have -Xmx235M -Xms235M
in your JVM args – i.e. 235 megabytes of memory. Increase that and the issue probably should be fixed.

I added memory and you can see the continued crash report below.
Minecraft Crash Report -------- Minecraft Crash Report ----// There are four lights!
Time: 5/23/18 10:33 AMDescription: Exception ticking world
java.lang.NullPointerException: Exception ticking world at bwi.a(SourceFile:186) at bwi.a(SourceFile:92) at bwm.d(SourceFile:60) at brt.a(SourceFile:298) at sj.a(SourceFile:307) at sk.a(SourceFile:249) at bbo.a(SourceFile:144) at sk.i_(SourceFile:199) at net.minecraft.server.MinecraftServer.w(SourceFile:694) at rv.w(SourceFile:365) at net.minecraft.server.MinecraftServer.v(SourceFile:627) at net.minecraft.server.MinecraftServer.run(SourceFile:532) at java.lang.Thread.run(Unknown Source)
A detailed walkthrough of the error, its code path and all known details is as follows:---------------------------------------------------------------------------------------
– Head --Thread: Server threadStacktrace: at bwi.a(SourceFile:186) at bwi.a(SourceFile:92) at bwm.d(SourceFile:60) at brt.a(SourceFile:298) at sj.a(SourceFile:307) at sk.a(SourceFile:249) at bbo.a(SourceFile:144) at sk.i_(SourceFile:199)
– Affected level --Details: Level name: Family Fun All players: 1 total; [sm['VirtualWandering'/384, l='Family Fun', x=-173.19, y=80.00, z=-161.87]] Chunk stats: ServerChunkCache: 370 Drop: 0 Level seed: -2134918553935009108 Level generator: ID 00 - default, ver 1. Features enabled: true Level generator options: {} Level spawn location: World: (-32,64,-208), Chunk: (at 0,4,0 in -2,-13; contains blocks -32,0,-208 to -17,255,-193), Region: (-1,-1; contains chunks -32,-32 to -1,-1, blocks -512,0,-512 to -1,255,-1) Level time: 6724 game time, 6724 day time Level dimension: 0 Level storage version: 0x04ABD - Anvil Level weather: Rain time: 44553 (now: false), thunder time: 95749 (now: false) Level game mode: Game mode: survival (ID 0). Hardcore: false. Cheats: falseStacktrace: at net.minecraft.server.MinecraftServer.w(SourceFile:694) at rv.w(SourceFile:365) at net.minecraft.server.MinecraftServer.v(SourceFile:627) at net.minecraft.server.MinecraftServer.run(SourceFile:532) at java.lang.Thread.run(Unknown Source)
– System Details --Details: Minecraft Version: 18w21a Operating System: Linux (amd64) version 2.6.32-696.18.7.el6.x86_64 Java Version: 1.8.0_111, Oracle Corporation Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Oracle Corporation Memory: 142113528 bytes (135 MB) / 518979584 bytes (494 MB) up to 518979584 bytes (494 MB) JVM Flags: 5 total; -Xmx512M -Xms512M -XX:+UseConcMarkSweepGC -XX:+CMSClassUnloadingEnabled -XX:MaxMetaspaceSize=128M Profiler Position: N/A (disabled) Player Count: 1 / 12; [sm['VirtualWandering'/384, l='Family Fun', x=-173.19, y=80.00, z=-161.87]] Data Packs: vanilla Is Modded: Unknown (can't tell) Type: Dedicated Server (map_server.txt)

Here are the console logs from the last crash
23.05 11:23:24 [Multicraft] Not restarting crashed server. 23.05 11:23:24 [Disconnect] User VirtualWandering has disconnected, reason: Server shutting down 23.05 11:23:24 [Multicraft] Server stopped 23.05 11:23:24 [Multicraft] Server shut down 23.05 11:23:23 [Server] Server Shutdown Thread/INFO Saving players 23.05 11:23:23 [Server] Server Shutdown Thread/INFO Stopping server 23.05 11:23:22 [Server] Server thread/INFO Saving chunks for level 'Family Fun'/the_end 23.05 11:23:22 [Server] Server thread/INFO Saving chunks for level 'Family Fun'/the_nether 23.05 11:23:22 [Server] Server thread/INFO Saving chunks for level 'Family Fun'/overworld 23.05 11:23:22 [Server] Server thread/INFO Saving worlds 23.05 11:23:22 [Server] Server thread/INFO Saving players 23.05 11:23:22 [Server] Server thread/INFO Stopping server 23.05 11:23:22 [Server] Server thread/ERROR This crash report has been saved to: /./crash-reports/crash-2018-05-23_11.23.22-server.txt

I'm also having extreme memory issues when exploring in singleplayer (which makes sense cause there is an integrated server).
I haven't crashed, but the world has stopped rendering and all mobs and block interactions are frozen. Memory is at about 98 % usage, then drops to 86 % from garbage collection most likely, rockets back up to 98% and repeats.
Edit: I cannot save and quit, it's no longer responding.

The second issue is MC-129136
This ticket is invalid as it relates to a modified or third-party client, server, or launcher.
Any non-standard client/server/launcher build needs to be taken up with the appropriate team, not Mojang.
Any plugin issues need to be addressed to the creator of the plugin or resource pack.
This site is for addressing issues related to the base unmodded Minecraft; any modded system invalidates your ticket, unless the behavior can be reproduced without mods.
Additionally, if you have problems on large-scale modded servers, please report it to their site. It's probably not a bug in Minecraft.
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