Q:

After upgrading my project to Angular 8 from Angular 7.2, compile time increased 3 times. How can I fix it

I upgraded my project to Angular 8 version. While upgrading process, I haven't  met any error. But the compile time increased 3 time without any error. At least, How can I get the old compile time?
** P.S.: There is a bug cause to this problem. The issue related to this bug** https://github.com/angular/angular-cli/issues/13734
Last Compile Before Angular 8  (with Angular 7.2)
Time: 1382.536ms -> main.cf29a89468d732f3f363.js (main) 12.4 MB 

First Compile After Upgrading to Angular 8
Time: 6379.317ms -> main.da4147c72278bc767ee4.js (main) 12.3 MB 

Second Compile After Upgrading to Angular 8 and After restart PC 
Time: 3147.254ms -> main.da4147c72278bc767ee4.js (main) 12.3 MB

tsconfig.json 
    {
     "compileOnSave": false,
     "compilerOptions": {
        "baseUrl": "",
        "declaration": false,
        "emitDecoratorMetadata": true,
        "experimentalDecorators": true,
        "mapRoot": "./",
        "moduleResolution": "node",
        "outDir": "../__dist_cli",
        "sourceMap": true, 
        "target": "es5 ", 
        "module": "es2015",
        "lib": [
            "es2016",
            "dom"
        ],
        "typeRoots": [
            "node_modules/@types",
            "typings/custom"
        ]
    }

Angular CLI: 8.0.0
Node: 12.3.1
OS: win32 x64
Angular: 8.0.0

A:

This problem is solved in the updated version of the Angular CLI (^8.2.1)

