**TypeScript Version:** 3.8.3, however I have tried 3.3.x as well as the latest 3.9.x and even updating the the rc version of 4.0 **Search Terms:** Fresh/cold build takes upwards of 50 minutes, both watch and regular build mode. Very high transform time. **Code** This is a private repo I started contributing too so I can't share it, but this is our tsconfig. ```json { "compilerOptions": { "declaration": true, "importHelpers": true, "module": "commonjs", "esModuleInterop": true, "outDir": "dist", "rootDir": "src", "strict": false, "target": "esnext", "forceConsistentCasingInFileNames": true, "allowJs": true, "checkJs": false, "lib": ["esnext"], "moduleResolution": "node", "incremental": true, "noImplicitAny": false, "assumeChangesOnlyAffectDirectDependencies": true, "listEmittedFiles": true, "extendedDiagnostics": true }, "include": [ "src/**/*" ], "exclude": [ "node_modules/**/*", "**/node_modules", "dist/**/*", "**/.*/", "*.test.ts" ] } ``` **Expected behavior:** Running a fresh build (without a .buildinfofile and the current dist folder if one exists) should compile in less time than it takes to do my laundry **Actual behavior:** Running a fresh build takes upwards of 1 hour, although I have seen a range of 35-50 minutes that is most common. **Related Issues:** https://github.com/microsoft/TypeScript/issues/35729