[CoolGuySteve]

Interesting that this article doesn't mention profile guided optimization. In my experience, PGO is able to eliminate a lot of the performance problems associated with unnecessary inlines and rarely called functions eating up cache space.

The major downsides are that you can only optimize what the profiler can see and running the thing to make a build takes forever.

[bzbarsky]

The major compilation targets for WebKit for Apple are MacOS and iOS, and compilation is with clang/clang++/llvm.

And clang's PGO support is not very good so far, so there isn't much to talk about...