If running Linux you can disable the meltdown/spectre mitigations with the nopti option [1].

1. https://yux.im/posts/technology/security/disable-meltdown-an...

Here is a similar windows tool: https://www.grc.com/inspectre.htm

'nopti' only disables the Meltdown mitigation. To disable all the mitigations (including Spectre, Meltdown, L1TF, and now MDS) you can use mitigations=off on newer kernels.

If you use Steam, it’s in the best interests of you and probably Valve not to worry about attacks to steal your library or get you banned.

Your public clouds at AWS probably use them too... and they won't disable HT ;)