IIS compression is more efficient because it is done at a lower level inside IIS.

But most people on shared hosting do not have access to the IIS settings, and compression requires fine tuning to insure that your apps are working, so for usability it is often more practical to apply compression at the application level.

So.. the type called Deflate Compression that is next to Gzip in the DNN host settings... is that IIS compression?

And if one selects Deflate Compression and it doesn't give any errors... will that mean it's likely to be working - or is a failure invisble when one doesn't have acccess to IIS Compression on a shared environment?

And if is working, then what should one set as the compression level in the same host settings.. it goes from 1-10 or 0-10 (I can't check now.. in middle of upgrading)

And also (see how much useful info one could write up for those little blue help icons), What number implies more compression (more cpu)... 1 or 10.. I'd guess 10, but who can tell. And in any case, what would be typical or comparable to the supplied Gzip compression... 5?

Thanks for any further info on these things,

Rob