I get this everytime I restart my phone. I do use Swiftkey. I have been having quick battery drains and sluggishness as well. Could this all be related to this? Also my messages send very slow and my phone gets really hot. This never happened before the kit kat update.
There is probably a cache error in the new ROM. You can try going into Settings>Storage>click on cache. That should clear most of it, and hopefully, the system cache as well.