角度4 ng的发球时间超过5分钟

Question

我的问题是，当我运行ng serve --source-map false或ng serve时。进行更改后，大约需要5至7分钟的时间来编译代码。

Angular版本4.4.7和其他详细信息如下所示：

Angular CLI: 1.7.4
Node: 8.10.0
OS: darwin x64
Angular: 4.4.7
... animations, common, compiler, compiler-cli, core, forms
... http, language-service, platform-browser
... platform-browser-dynamic, router, tsc-wrapped

@angular/cli: 1.7.4
@angular-devkit/build-optimizer: 0.3.2
@angular-devkit/core: 0.3.2
@angular-devkit/schematics: 0.3.2
@ngtools/json-schema: 1.2.0
@ngtools/webpack: 1.10.2
@schematics/angular: 0.3.2
@schematics/package-update: 0.3.2
typescript: 2.5.3
webpack: 3.11.0