Not saying it's not worth it, just, it's strange to put them in the same sentence when one is what makes the difference between usable and completely unusable.

Not saying it's not worth it, just, it's strange to put them in the same sentence when one is what makes the difference between usable and completely unusable. I lived with 20-60s dirty build times for 1-line changes at symmetry, solely because of redundant compile-time recomputation—I wouldn't wish that on anybody. 10x would have been on the upper edge of tolerable, but you certainly won't get 10x for 'cheap'—and even so, latency should rightfully be measured in the milliseconds, not seconds. (~10x, incidentally, is quoted as an upper bound for newctfe here https://forum.dlang.org/post/qxiggjwhvadbpdfkidvu@forum.dlang.org https://forum.dlang.org/post/qxiggjwhvadbpdfkidvu@forum.dlan..., had it ever materialised.)