# Choose between Synchronous and Asynchronous methods

The generic tag comes in two versions: synchronous and asynchronous.

## The Synchronous mode

**In synchronous mode**, your website’s code scripts will load one after the other. A script can only be loaded if the previous one has finished loading. If a script is blocked, it will stop the script after it from loading.

![All\_About\_Tags\_03.png](https://2350286830-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2F6Yw9IRJ6KbbucQPwZUCZ%2Fuploads%2Fgit-blob-b8865a71a0b6b55346fc3898358845ff0bf1f46a%2Fea5a2de464f72f45a1b1257d6b72c790.png?alt=media)

## Asynchronous mode

On the other hand, **in asynchronous mode**, the different calls to the scripts will be made at the same time. All the scripts will load at the same time. In this case, if a script hangs up, it will not stop the other scripts from loading.

![All\_About\_Tags\_04.png](https://2350286830-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2F6Yw9IRJ6KbbucQPwZUCZ%2Fuploads%2Fgit-blob-130ca34879dd7aac7a0ff9320b2dd1a3a1948f07%2F5c1dbfd49e5eb77e47d30b89b771ac21.png?alt=media)\
The disadvantage of an asynchronous tag is that the screen may seem to flicker if the modifications are applied after the website loads.

{% hint style="success" %}
In most cases, we recommend using the synchronous tag for AB Tasty. If the tag is placed in your website’s **\</head>** tag, you will be sure that your modifications will be applied immediately, before the website loads. This will avoid the flickering effect and will offer an optimal user experience.
{% endhint %}