Nobody has mentioned the latency issue when gzipping. If you have to construct the whole file before gzipping, in situations where the file is large or dribbles out as the server processes the data, this could mean a significant slowdown. In virtually all situations, I agree gzipping is good, just like I always leave write-caching on my hard drive turned on so that the slowest part of my system can run at the fastest possible speed. There just might be consequences you do not intend. To address the obvious replies: yes, your server should not dribble out content. And, yes, if you are using a framework that spits out the entire page at once already, you will incur no additional latency on top of the gzip/gunzip time.