vue 项目在 hmr 时 rebuild 特别慢

修改一行就要 rebuild 大概 10s，这效率没法干活了 T_T 看了不少文章说开 dllPlugin 有效，但我们这项目实测也没用

贴个 progress

webpack: Compiling... 308ms building modules 50ms sealing 0ms optimizing 0ms basic module optimization 6ms module optimization 3ms advanced module optimization 53ms basic chunk optimization 0ms chunk optimization 0ms advanced chunk optimization 0ms module and chunk tree optimization 0ms chunk modules optimization 1ms advanced chunk modules optimization 13ms module reviving 0ms module order optimization 5ms module id optimization 6ms chunk reviving 3ms chunk order optimization 10ms chunk id optimization 44ms hashing 5ms module assets processing 76ms chunk assets processing 39ms additional chunk assets processing 0ms recording 418ms additional asset processing 0ms chunk asset optimization 8396ms asset optimization 95% emitting DONE Compiled successfully in 9512ms 

查不到这个 asset optimization 在做啥

 + 52 hidden assets [466] (webpack)/hot nonrecursive ^\.\/log$ 170 bytes {5} [built] [] -> factory:1ms dependencies:0ms = 1ms [499] ./node_modules/moment/locale ^\.\/.*$ 2.88 kB {5} [optional] [built] [] -> factory:0ms building:0ms dependencies:1ms = 1ms [1048] ./src/module/user/userCredit/userCredit.vue 1.57 kB {7} [built] [] -> factory:0ms building:1ms dependencies:5318ms = 5319ms [1050] ./node_modules/css-loader?{"minimize":false,"sourceMap":false}!./node_modules/vue-loader/lib/style-compiler?{"vue":true,"id":"data-v-4eeb260f","scoped":true,"hasInlineConfig":false}!./node_modules/sass-loader/lib/loader.js?{"sourceMap":false}!./node_modules/sass-resources-loader/lib/loader.js?{"resources":"/Users/linxi/Develop/maitao/h5-refactor/src/common/scss/variables.scss"}!./node_modules/vue-loader/lib/selector.js?type=styles&index=0!./src/module/user/userCredit/userCredit.vue 4.01 kB {7} [built] [] -> factory:0ms building:0ms dependencies:1ms = 1ms [1060] ./node_modules/babel-loader/lib!./node_modules/vue-loader/lib/selector.js?type=script&index=0!./src/module/user/userCredit/userCredit.vue 5.69 kB {7} [built] [] -> factory:1ms building:44ms dependencies:14ms = 59ms [1061] ./node_modules/vue-loader/lib/template-compiler?{"id":"data-v-4eeb260f","hasScoped":true,"transformToRequire":{"video":"src","source":"src","img":"src","image":"xlink:href"},"buble":{"transforms":{}}}!./node_modules/vue-loader/lib/selector.js?type=template&index=0!./src/module/user/userCredit/userCredit.vue 3.15 kB {7} [built] [] -> factory:1ms building:58ms = 59ms + 1156 hidden modules 

就是当前修改的那个 vue 文件 dependencies 耗时巨长

项目是拿 vue-cli 建出来的，不知道怎么能进一步 profile?