What is the best HTTP Compression profile settings?

You really won't notice a difference. I've been using 6 for years on high volume sites with no issues.

A few other notes from me;

• Deflate (based on zlib) is preferable to gzip as gzip uses the deflate algorithm anyway but is generally slower due to its use of larger headers and trailers and a slower integrity check (aka checksum) compared to zlib used alone

   

• Set the Chunking setting in the HTTP Profile to selective as this only rechunks data if the response payload has been modified (which should only happen if compression has taken place) and if the server response was itself chunked. Responses that the server did not chunk will have the value of their Content Length HTTP header rewritten accordingly.

   

• I use these content types;

   

  application/(xml|x-javascript)

   

  text/

   

  image/svg+xml

   

  application/x-www-form-urlencoded

   

  application/http

   

  application/pdf Most people say don't but I find there's still a benefit

   

  application/json

   

  application/msword

   

  application/vnd.ms-excel

   

  application/vnd.ms-powerpoint

   

  application/vnd.ms-project

   

  application/vnd.ms-xpsdocument

   

  application/x-shockwave-flash