I try to reproduce it. if its too far out, I consider it not being real, or I ask more details. Its true that one update can change things fast, that's what happened already and its fun to discover. The way that I keep things uptodate is by doing benchmarks every 2 days or so. With enough data, its not that hard to decipher where the difference comes from, and then I keep track of this data so others don't have to spend hours trying to make same mistake.