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Measured with crates/engine/examples/bench.rs (perf/xtask-bench), 100k rows, M2 Pro: enter.formulas 465 -> 420 ms (23829d8c: 375), xlsx.save 540 -> 488 ms (466). - number_to_text: the round-up-to-1E+15 check (f29ac7d9e) formatted every number with exact {:.14e} and parsed it back; formula printing calls it once per literal. Run it only for magnitudes that can round up (>= 9.9999999999999e14). Same output; boundary tests added. - Expr clone/map, xlsx prefix_params: a binary node whose left operand is not a chain no longer allocates a spine Vec (2aeb21d4d); map rewrites the operands in their boxes. Expr::walk reserves room for a typical formula up front. - grow_autofilter checks the sheet has an AutoFilter before looking up the cell. - retained_bytes_against looks up the newer band's row once per row, not per cell. - The journal measures an entry's JSON size with a counting writer instead of building the text (a big paste's params are MBs). The rest of the enter.formulas gap and all of edit.fanout's (~+12%) is Undo's byte budget (72db972de, #1227): sizing each snapshot and freeing evicted ones, an intended cost of bounded memory. Co-authored-by: nihilist-narwhal <240798405+nihilist-narwhal@users.noreply.github.com> Co-authored-by: Claude Opus 5.5 <noreply@anthropic.com>