I'd love if you'd elaborate on this. I know very little about what VirtualProtect actually does under the hood but, in theory, it should just have to flip a couple bits in the address space mapping which says what the protection level is.
You are assuming things you are unsure about :) Even if your assumption was correct things could change from one Windows update to another.
When I worked on a time sensitive java project, our test suite had benchmarks for JDK functions as simple as Arrays.copy() to make sure we are the first to notice if something changed under the hood.
