When web pages are stuck or responding slowly, you should consider using Web Workers. It is mainly suitable for three types of scenarios: one is to perform calculation-intensive tasks such as image processing, data encryption, complex algorithms, etc.; the second is to perform background operations that do not rely on DOM, such as background polling, resource preloading, and timing inspection; the third is to process multiple tasks in parallel, such as automatic saving and syntax checking, thereby releasing the main thread to improve page response speed and fluency.
Web Workers is a technology that implements multi-threaded operations in the browser. It can separate some time-consuming tasks from the main thread to execute, avoiding blocking page rendering and user interaction. If you find that web pages are stuttering and slowing in response to certain tasks, it may be time to consider using Web Workers.
Long-running or compute-intensive tasks
When you need to perform tasks such as image processing, data encryption, complex algorithms (such as sorting, search), etc. that occupy a large amount of CPU, these operations will directly affect the user experience if they are performed on the main thread. for example:
- Filter and aggregate large data sets
- Perform JSON parsing or compression
- Implement local search functions (such as offline document retrieval)
In this case, throwing tasks to the Web Worker can maintain the smoothness of the page and will not let the browser "fake death".
Backend tasks that do not depend on DOM
The biggest limitation of Web Worker is that it cannot directly access the DOM. But this also means it is very suitable for some background work that does not involve interface updates, such as:
- Backend polling to get data
- Preload or preprocess resources
- Execute timing tasks (such as checking status every few seconds)
If your task is just running silently in the background and does not need to directly modify the page content, Web Worker is very suitable.
Handle multiple tasks in parallel
Although JavaScript is a single-threaded language, Web Worker provides a parallel processing capability. For example, you are making an online editor and you need to deal with:
- User input
- Automatically save drafts
- Real-time syntax checking
At this time, you can use multiple Workers to handle automatic save and syntax checking separately, so that the main thread can focus on user input and improve response speed.
However, it should be noted that not all tasks are suitable for splitting them. Creation and communication are overhead, while small and fast operations will be slower because of adding Worker.
Basically these scenes. Web Worker is not complicated, but is easily overlooked, especially in the early stages of development. When you find that the page starts to "gasp", look back and see if some tasks can actually be handed over to the Worker to run.
The above is the detailed content of When should you use Web Workers to improve performance?. For more information, please follow other related articles on the PHP Chinese website!
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