measure build graph.md

test("measure: build graph with new context") when run individually

Defs: 30000 Iter 0: 3794 ms Defs: 32998 Iter 1: 715 ms Defs: 32999 Iter 2: 451 ms Defs: 32999 Iter 3: 416 ms Defs: 32999 Iter 4: 317 ms Defs: 32999 Iter 5: 358 ms Defs: 32999 Iter 6: 264 ms Defs: 32999 Iter 7: 257 ms Defs: 32999 Iter 8: 447 ms Defs: 32999 Iter 9: 285 ms Total time: 7304 ms