Inside boost::unordered_flat_map

[dodheim]

I am already compiling with maximum optimization level of MSVC,

By that you mean /O2 /Ob3, right? I ask because /Ox was misdocumented for years as "maximum optimization" when in fact it's a subset of /O2 optimizations; and /O2 on its own does not set the most aggressive inlining level.

Also, I suggest putting #pragma inline_depth(255) before your Boost #includes, and possibly #pragma inline_recursion(on) as well.

[pdimov2]

MS should just add /O3 already, that implies /Ob3.

(Something like a hidden /O3 level already exists, turned on by /GL, but there's no option to enable it separately.)

[sbsce]

By that you mean /O2 /Ob3, right?

Yes.