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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:

import time
import groupdocs.viewer as gv
import groupdocs.viewer.options as gvo

# Define a path to cache
cache_path = "cache"
cache = gv.FileCache(cache_path)
settings = gv.ViewerSettings(cache)

# Define a Viewer for a "sample.docx" file
with gv.Viewer("sample.docx", settings) as viewer:
    options = gvo.HtmlViewOptions.for_embedded_resources()

    # Define the execution time of the first call
    start_time = time.time()
    viewer.view(options)
    
    elapsed_time = time.time() - start_time
    print(f"Time taken on first call to View method {elapsed_time * 1000:.0f} (ms).")

    # Define the execution time of the second call
    start_time = time.time()
    viewer.view(options)

    elapsed_time = time.time() - start_time
    print(f"Time taken on second call to View method {elapsed_time * 1000:.0f} (ms).")

The following image shows a sample console output:

For details, please refer to the following pages: