Framerate lag, major lag spikes

NOTE! This is NOT sound lag or block lag I'm talking about. It is frame lag. So don't mark my report as a duplicate.

Even if I crippled myself to a measly 6 chunks and 4 chunk simulation distance, my Windows 10 Minecraft lags like hell, and especially throws a tantram if I look at a few mobs.

Please make some drastic optimisations to the engine code, and also mobile lags more, so there is something even wrong with the old engine.

Your team is forcing me to permanently migrate to Java Edition Minecraft.