: What Gzip compression level can safely be used for sitemap files? I can use PHP's gzencode function to set the compression level of data to compress and I want to compress my sitemap files

@BetL925

All Gzip decompression programs can decompress any of the levels. The compression level doesn't change the format of the output at all.

The compression level is good for managing load on your server. Gzip will spend many more CPU cycles trying to compress the data better when you specify a higher compression level.

In my experience the benefits of higher compression levels are modest at best. The default compression level is almost as good as the higher compression levels and much less intensive during compression.

As a general rule you should use lower compression levels if you are compressing something on the fly. If you are compressing something that will be downloaded thousands of times you could think about using higher compression levels.

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