performance

问题 I'll start this question from notion that I've seen a similar question on StackOverflow , but that question had only answer for the difference . What I'm asking is what should I use depending on situation and what drawbacks one or another method may have . I know that detectChanges runs immediate change detection cycle on an element and its children, meanwhile markForCheck only marks current element and its ancestors as dirty and that they should be checked on the next change detection cycle.

问题 For years, web developers have followed the logic that minimizing HTTP connections speeds up applications because the browser isn't choking on the download/execution of code. For example Yahoo has long touted their best practices, and tell us to combine CSS/JavaScript/image resources into single files - thereby reducing the total number of HTTP requests and compressing the total resource size. But other "best practices" exist with regards to increasing webpage speed - specifically, maximizing

问题 For years, web developers have followed the logic that minimizing HTTP connections speeds up applications because the browser isn't choking on the download/execution of code. For example Yahoo has long touted their best practices, and tell us to combine CSS/JavaScript/image resources into single files - thereby reducing the total number of HTTP requests and compressing the total resource size. But other "best practices" exist with regards to increasing webpage speed - specifically, maximizing

问题 For years, web developers have followed the logic that minimizing HTTP connections speeds up applications because the browser isn't choking on the download/execution of code. For example Yahoo has long touted their best practices, and tell us to combine CSS/JavaScript/image resources into single files - thereby reducing the total number of HTTP requests and compressing the total resource size. But other "best practices" exist with regards to increasing webpage speed - specifically, maximizing

问题 When using System.Diagnostics tracing, is there a significant (measurable) performance impact on not removing the "Default" trace listener on a production ASP.NET application in release mode, with the TRACE constant defined at compilation time but with no debugger attached at runtime? To clarify, the question is about additional impact of the "Default" trace listener on an application that is using other trace listeners, not about alternatives to System.Diagnostics tracing. Are there any

问题 The application i'm working on renders an array of persons and their children. There are about 600 persons in the array. I am displaying the person name and the names of each person's children in text inputs so that they can be edited. I use a V-model for two way binding so I can easily save the edits. <tr v-for="person in persons"> <td> <input type="text" v-model="person.name" /> </td> <td v-for="child in person.children"> <input type="text" v-model="child.name" /> </td> </tr> The problem is

问题 I am writing a 3D collision, and want to know the difference in performance of basic math functions like + - * / sqrt pwr trigonometry like sin cos tan arcsin.. I heard it depends on many other things so I just want to get a rough idea about which one is slower and need to avoid while finding different ways to solve the problem. Also I want to know the order and the magnitude of the difference Thanks Edit: I write in VC++ for x86. But knowledge in other architectures and general picture are

问题 I'm using Node.js to loop through what could eventually be a pretty big array of posts. If I were doing something similar using client side JavaScript , I would use timers as explained here so as not to block the thread. My Question is: "Is still a sound practice server side?" or "Should I approach the problem differently?" 回答1: The proper way to do that in node.js is to break up your work into chunks and use process.nextTick to queue the next chunk once the current one has completed. That

问题 I've being benchmarking an algorithm, it's not necessary to know the details. The main components are a buffer(raw array of integers) and an indexer (integer - used to access the elements in buffer). The fastest types for the buffer seem to be unsigned char, and both signed and unsigned versions of short, int, long. However char/signed char was slower. Difference: 1.07x. For the indexer there was no difference between signed and unsigned types. However int and long were 1.21x faster than char

问题 So.. I'm building a chrome extension and it includes a simple popup page that appears when you click on the extension's icon. This popup page consists of some simple HTML, CSS and jQuery code. Nothing fancy. The JS seems to be running fine but the CSS hover, transition, and animation effects are extremely laggy (up to 5 seconds lag) when I interact with it on an external monitor. Everything else runs perfectly fine and I can see that the JavaScript is executing as expected. It's just the