Over the past two weeks, mortgage lenders have seen their application volumes and origination pipelines get whipsawed by rising interest rates. But it’s not the run-up in rates, per se, that set off alarm bells in the industry. It’s how fast rates climbed. As Inside Mortgage Finance went to press this week, the yield on the benchmark 10-year Treasury was at roughly 2.60 percent. On a historical basis, that’s an attractive rate – and as many lenders have pointed out: consumers can still obtain a 30-year fixed-rate conventional loan at 4 percent, depending on the points paid. But a month ago, the 10-year Treasury was...