Without Py_LOCAL_INLINE all mickrobenchmarks become about 20% slower.

I'm not sure that all these changes are needed. Maybe the same effect can be achieved by smaller changes. But I tried and failed to achieve the same performance with a smaller patch yet. Maybe you will be more lucky.

Note that even with this patch type slots still about 5% slower than ordinal methods (despite the fact that using operators needs less bytecode instructions than calling a method). There is some additional overhead.