no, it wont. The idea is to configure web-server that it gzips pvrtc before sending
also switch on static gzip if its under heavy load
gzip is the part of protocol, not the file itself
its managed by web-server and browser
server sends gzipped file instead of normal one, and browser unzips it , and gives normal file to JS side
gzip by default is enabled for html/css, but not for other file extensions. You have to manually enable it in config, and if your server is under heavy load, configure and enable "static gzip"
well, its the best way unless somehow browsers start support for formats like BASIS/CRUNCH. Making JS-side uncompressor is not effective :( At least for our game emscripten-ed crunch was too slow.