This utility optionally packs binary assets (images, fonts, ...) into a single PNG file.
The benefit of doing so is that your ad will make fewer requests for assets. The downside is that additional cycles are necessary to parse the fba-payload back into dataURIs for DOM elements.
Tests should be done to see if networks supporting HTTP2 load multiple image/font requests faster than the client can parse the FBA-payload.
Switch on FBA-compiling in Creative Server in the deploy profile, like: