tick lag in a single player world - Java Edition Support

Hi; little help here? I'm having massive tick lag in the nether if that makes any sense, was wondering what was the cause and how I could fix it if anyone knows?

I have high MS (lag) in my single player minecraft world - Java Edition Support - Support - Minecraft Forum - Minecraft Forum

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Minecraft » TICK PERFORMANCE ADD-ON » FIX LAG

1.0.13] Server tick lag when >1 player is online · Issue #1091 · AllTheMods/ATM-8 · GitHub

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1.5.2] EXTREME Tick lag in world gen, freezes in place (Please help) - Java Edition Support - Support - Minecraft Forum - Minecraft Forum

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My Minecraft single player survival world lagging after updating it to 1.15.2