Performance is a deciding factor in the success (or failure) of any web application. Frequent web crashes and long waiting times are annoying for visitors.
Kissmetrics found that:
- 47 percent of visitors expect a website to load in less than 2 seconds.
- 40 percent of visitors leave the website if the loading process takes more than 3 seconds.
I will tell you 9 tips that you can use to notice a multi-fold improvement in the performance of your application. Let’s get started with them.
Remove unused JavaScript
It not only reduces the transmission time but also the time that is taken by the browser to analyze and compile the code. You should consider the following points while removing unused JavaScript:
- If you detect a functionality that is not being used by users, remove it altogether along with its associated JavaScript code.
- If a library was included by mistake and is not necessary, eliminate it as well.
Cache in the browser
You can cache in the browser in two ways. The first option is to use the JavaScript Cache API by installing a service worker. Second, you can use the HTTP protocol cache.
SEE ALSO: Small embeddable JavaScript engine with QuickJS
Developers use scripts to provide access to a certain object. By storing such objects inside the memory of a user-defined variable, and using a variable in subsequent references to that object, you will notice an immediate improvement in performance.
Avoid memory leaks
The Java Virtual Machine (JVM) continuously analyzes an application during its lifecycle and detects objects that are not in use anymore. These objects are collected as garbage. A memory leak is a situation when the JVM is unable to recognize the unused objects, thus leading to the accumulation of garbage in the system.
During a memory leak, the loaded page will gradually occupy all of the available memory of the device and severely affect the performance.
In Chrome Dev Tools, memory leaks can be analyzed by recording a timeline in the Performance tab.
Establish well-defined environments for testing
As a developer, you need to test the applications before they go live, and testing the code requires a set of well-defined environments.
It is impractical to do performance tests and optimizations for all versions of all Javascript engines. On the other hand, you will get partial results if you do the testing in a single environment.
So, you should go a step further to establish well-defined testing environments, so that the application does not suffer from poor performance later on.
Source : JAXenter