> From: "François REMY" <[email protected]> > To: <[email protected]> > Date: Mon, 12 Sep 2011 22:31:17 +0200 > Subject: Re: IDE support? > Types are not only "desirable" to borrow concepts from current IDEs. We know > from DotNET that a language running in a VM can be pretty fast, close to a > native language. But it has to be simple for the computer. JavaScript is > simple for the developer, but sometimes its flexibility makes it impossible > to "optimize" code properly. And it makes JavaScript slower. > > Or, to be exact, it doesn't allow to make 95% of our code faster because it > would break the other 5%. The more a compiler understand what you're doing, > the more it will be confident that optimizing is safe. Types may be part of > the data a compiler may use. It doesn't need to be the only one, but it can > be a very important one.
Ah, but let's be exact then: what proportion of most Web applications will benefit from type-based performance improvements? The reason I ask is that the diagrams that Wes posted show two things. One is obvious: the dramatic improvement in JS. Yay! Congrats to all involved! The other is less obvious: further improvements in JS performance are less and less important. Not "unimportant" and not "insignficant". Just less important because the total performance depends on many factors of which JS -- for most pages most of the time -- may no longer be the critical factor. And even when JS is important, type-based improvements will only be a small factor really. In the big picture, such a fundamental change may not be very valuable. Of course I am guessing, and having real performance analysis numbers would be excellent information. jjb _______________________________________________ es-discuss mailing list [email protected] https://mail.mozilla.org/listinfo/es-discuss
