Sample project to demonstrate performance issue with ts-jest (>=23.10.0) on Windows
Looks like problem with resolver?
yarn
yarn fast-test - test without imports (5.82s)
yarn slow-test - test with imports (29.61s)
Normal script with imports works fast
yarn normal-script-is-fast
Previous versions of ts-jest works better.
Try to change branch to ts-jest-23.1.4 and repeat above steps (it's better 4.78s vs 10.9s)
On Linux more or less nothing changed
23.1.4: 3.6s vs +-9s
24.0.2: 4.7s vs +-9s
Profiling:
node --prof node_modules/\@angular/cli/bin/ng test sample --test-file slow-test.spec.ts
node --prof-process isolate-*-v8.log