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**Problem:** The treesitter `foldexpr` calls `get_parser()` for each line in the buffer when calculating folds. This can be incredibly slow for buffers where a parser cannot be found (because the result is not cached), and exponentially more so when the user has many `runtimepath`s. **Solution:** Only fetch the parser when it is needed; that is, only when initializing fold data for a buffer. Co-authored-by: Jongwook Choi <wookayin@gmail.com> Co-authored-by: Justin M. Keyes <justinkz@gmail.com>