Pleased to report I don't have empirical evidence of this being a BTT-sourced latency problem.
I found an anomaly in my enterprise-scale Google Sheets workbook that causes me to state the above.
Sheets would lose its mind when I was using a saved view that crossed a thousand-row difference between rows. When I would try to ⌘-
-↓ it would add severe latency, causing BTT macros to exceed all timing instructions. This happened intermittently. Other saved views with similar boundary spans would work as expected.
If I deleted the row(s) that was involved in the latency, operations would resume properly.
Fun.