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Caching saves rendering results to a specified location, such as a local disk. When you re-request the rendering results, GroupDocs.Viewer does not render again, but uses the cached results. As a document can take a long time to render, use caching if you expect to reuse the rendering results.

To enable caching, follow these steps:

1. Instantiate the desired cache object (for example, FileCache to store document rendering results at the local drive)
2. Instantiate the ViewerSettings object. Specify the cache object as a parameter of the constructor.
3. Instantiate the Viewer object. Specify the ViewerSettings object as a parameter of the constructor.
4. Call the view() method of the Viewer class.

The following code snippet shows how to enable caching and displays the difference between rendering a file and getting the cached results:

const cachePath = "cache";
const cache = new FileCache(cachePath);
const settings = new ViewerSettings(cache);

const viewer = new groupdocs.viewer.Viewer("sample.docx", settings)
const options = HtmlViewOptions.forEmbeddedResources();
const currentTimeMillis = Date.now()

viewer.view(options);
currentTimeMillis = Date.now() - currentTimeMillis
console.log("Time taken on first call to View method " + currentTimeMillis + " (ms).")
currentTimeMillis = Date.now()

viewer.view(options)
currentTimeMillis = Date.now() - currentTimeMillis
console.log("Time taken on second call to View method " + currentTimeMillis + " (ms).")

The following image shows a sample console output:

For details, please refer to the following pages: