Hello, Evgeny. Panasyuk, you wrote: EP> It all is not necessary in case of usage JS in quality "" VM (which it is generated at C compilation ++-> JS) - and such is very fast (asm.js). V8 about asm.js like as continues nothing the nobility about asm.js. And works well enough and without. But, here I agree. EP> It I to that JS it is possible to consider as a VM/platform instead of as language for immediate writing of the code manually - and in this case resultant application can be very fast. Here - again yes, you are right. At the same time V8 (I worked only with it), not such ideal and it is not assured in what pours out (we considered it already?) . Not all one and as it will conduct itself(himself) - I do not know. Plus, chrome explicitly gathers with PGO . As far as I know only it gives a gain in V8 on 10-20 %, the data old. I to that the piece licked enough-> yields more good results than on the average on chamber. Though to speak about JS as about JS VM to me it not seems correct. In sense nevertheless in a web - while probably it is more executed the code .:D But I look at it a little on another: the banal page (we about a web) is a horse-radish knows that. 20-30 frames from ads, heaps of chaotic switching-on and the most intricate usages, here to you and any mysterious setInterval fn 100ms where fn through jquery selects fantastic selectors. And timers such - pieces 30 and them nobody . I as obliges often analyze pages, therefore saw enough everyone. I am assured that at you on page of such nonsense would not be. But if we implement the stranger iframe - we already have chances of that us interrupt on the timer for unknown time. I am faster in this sense. . However, that is strange - works. Well and for ... There at all I do not know pure or not pure i/o bound. uTorrent at me downloading for the speed 10MBps percents almost does not eat. On the modern computer all quickly. And you get for the machine more feeblly - brakes are notable everywhere, and in browsers do not seem good idea. Generally browsers seem worthless idea. Though both get warm - and are good again. EP> I told that it faster similar C# the code, instead of a C ++. to me. , late - blunted.