Fixes: lp:1783993 * https://bugs.launchpad.net/kicad/+bug/1783993
Knocks about 1/3 off the first footprint load, and more than 1/2 off subsequent loads.
Fixes: lp:1784178 * https://bugs.launchpad.net/kicad/+bug/1784178 Fixes: lp:1780363 * https://bugs.launchpad.net/kicad/+bug/1780363