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Serious question: In old Sandy Bridge days it was recommended to disable hyperthreading. That would decrease heat produced by CPU and allow better overclocking (2600k versus 2500k debate).

Are there some features in CPU (such as hyperthreading), I can disable, so I can run system without those workarounds? I think faster Linux kernel could offset slightly lower CPU performance. Also there is lower energy consumption on laptop...

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On Intel: For some mitigations disabling hyperthreading will disable them as some vulnerabilities are only present with it enabled. That being said, the overall performance impact will be greater from disabling hyperthreading than by enabling the mitigations (though some vulnerabilities remain so long as you don't disable hyperthreading).

I wouldn't expect lower energy energy consumption from disabling hyperthreading: completing tasks faster allows the CPUs to reduce frequency faster.

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