Tip of the Iceberg

Category show-n-tell thursday
Domino uses gzip to compress most of Domino Web Access, which enhances the performance - particularly on slower connections. By being sneaky (namely, by mucking with the design of the Domino Directory), one can enable this feature for applications as well. Unfortunately, it doesn't seem to work reliably yet, which may be why it's hidden for now. The good news is that there is a legitimate way to successfully take advantage of gzip compression for static files (i.e. file resource design elements):

1. Download gzip.
2. Compress your file(s) using the default settings, which will shrink the content and append a .gz extension. NOTE: make a backup of each file prior to compression, as the default settings cause the file to be replaced with the compressed version, instead of a new file being created.
3. Copy each compressed file to the appropriate location (i.e. import / refresh a file resource, store the file in Domino's html folder, etc.), and update any references to the old filename to link to the new filename.
4. Create a website rule document in the Domino Directory:

With the rule in place, any file with a .gz extension requested from the site to which it applies will automatically receive a Content-Encoding header with a value of "gzip", which tells the browser to decompress the file prior to rendering it. For further performance benefits, the rule can be given expiration settings to tell the browser to cache the file for a given number of days or until a specific date - in the latter case, a date in the past can be specified to force the browser to always retrieve a fresh copy, in case the file will be updated frequently.

Although this approach is not applicable to dynamically generated content, it can significantly enhance performance for static content. For example, XIDED uses a single JavaScript file that (at present) weighs in at 1.45 MB prior to minification and compression. Dean Edwards' Packer reduces this to 346 KB, and gzip further reduces it to 131 KB... 9% of the original size. Even over broadband connections, such as cable and DSL, this reduces the page load delay by several seconds; over dialup, the benefit is particularly noticeable.

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