Game Desync & Crash When Casting Spells

[AetheriMC]

Minecraft version: 1.12.2 Wizardry version: 4.2.11 [change as necessary] Environment: Forge-14.23.5.2847 Server

Issue details: Players are experiencing severe desync and lag immediately after casting a spell. Occasional crashes occur as well if multiple attempts are made repeatedly. The crash generally occurs for the caster but other players are experiencing crashes too. The server will also occasionally crash but not every time. The server console outputs "Can't Keep Up!" messaging after casting spells. The lag and desync started happening after the installation of a few performance mods, however the mods were removed for testing but the issue has persisted. The names of those mods have been added below.

Other mods potentially involved (All but Arcane Essentials removed): Arcane Essentials - https://www.curseforge.com/minecraft/mc-mods/arcane-essentials Surge - https://www.curseforge.com/minecraft/mc-mods/surge FoamFix - https://www.curseforge.com/minecraft/mc-mods/foamfix-optimization-mod Dynamic View - https://www.curseforge.com/minecraft/mc-mods/dynamic-view GottaGoFast - https://www.curseforge.com/minecraft/mc-mods/gotta-go-fast FastFurnace - https://www.curseforge.com/minecraft/mc-mods/fastfurnace FastWorkbench - https://www.curseforge.com/minecraft/mc-mods/fastworkbench

Link to crash report: https://pastebin.com/yYPZ1C2V Link to server log: https://pastebin.com/ta56gffx