This page has 72 external Javascript scripts. Try combining them into one.
My YSlow Firefox plug-in was telling me that I had included too may JavaScript files, and that they should be combined into a single-file, and minified. The default setup of Mapfish has a single script include (mfbase\mapfish\MapFish.js), but this script automatically loads around 40 further scripts.
I tried a couple of unsuccessful attempts at copying and pasting various Mapfish JS files into an online JavaScript compressor. However when referencing the minified file I kept getting “undefined” errors from various Mapfish plugins and OpenLayer objects.
Initially I was looking to download a ready-made “compiled” MapFish file, but was unable to find a version online. I have uploaded a zipped version so if you want the file without going through the steps below you can download a copy. Note that if you have made any modifications to the MapFish files then these will not be available, and there are no guarantees it will work.
There are instructions on creating a single-file Mapfish client build on the Mapfish site. This process uses JSBuild which is part of JSTools – “a collection of python scripts for packaging and efficiently serving javascript.”
Unfortunately these instructions require a Linux operating system, and I’m using Windows. I eventually managed to “translate” these into Windows commands, and have documented the steps below.