It took too long time to install dependencies with yarn

I want to deploy a static website similar with vuepress site.
But it took too long to install dependencies and show the message info There appears to be trouble with your network connection. Retrying... when I use yarn to install dependencies.
the installation took Done in 425.10s., can you help me reduce the time?

My instance is: https://app.netlify.com/sites/naughty-wescoff-652eb1/deploys/5de742a5d60d1b0ad0fddd20, thanks!

the logs is below:

1:22:45 PM: Build ready to start
1:22:48 PM: build-image version: 9cade8af58c2cf3a17a1e9433d2e979149488837
1:22:48 PM: build-image tag: v3.3.5
1:22:48 PM: buildbot version: eb060c4dc3a8a73f9004f460f04632708166ca51
1:22:48 PM: Fetching cached dependencies
1:22:48 PM: Failed to fetch cache, continuing with build
1:22:48 PM: Starting to prepare the repo for build
1:22:48 PM: No cached dependencies found. Cloning fresh repo
1:22:48 PM: git clone https://github.com/ly525/luban-h5
1:22:49 PM: Preparing Git Reference refs/heads/dev
1:22:50 PM: Starting build script
1:22:50 PM: Installing dependencies
1:22:51 PM: v10.17.0 is already installed.
1:22:52 PM: Now using node v10.17.0 (npm v6.11.3)
1:22:52 PM: Attempting ruby version 2.6.2, read from environment
1:22:53 PM: Using ruby version 2.6.2
1:22:53 PM: Using PHP version 5.6
1:22:53 PM: Started restoring cached node modules
1:22:53 PM: Finished restoring cached node modules
1:22:53 PM: Started restoring cached yarn cache
1:22:53 PM: Finished restoring cached yarn cache
1:22:53 PM: Installing yarn at version 1.17.0
1:22:53 PM: Installing Yarn!
1:22:53 PM: > Downloading tarball...
1:22:53 PM: [1/2]: https://yarnpkg.com/downl
1:22:53 PM: oads/1.17.0/yarn-v1.17.0.tar.gz --> /tmp/yarn.tar.gz.pHIYE4bktF
1:22:53 PM:   % Total    % Received % Xferd  Average Speed   Ti
1:22:53 PM: me    Time     Time  Current
1:22:53 PM:                                  Dload  Upload   Total
1:22:53 PM:    Spent    Left  Speed
1:22:53 PM: 
  0     0    0     0    0     0
1:22:53 PM:     0      0 --:--:-- --:--:-- --:--:--     0
1:22:53 PM: 
  0     0    0     0    0     0      0
1:22:53 PM:   0 --:--:-- --:--:-- --:--:--     0
1:22:54 PM: 
100    93  100    93    0     0    398      0 --:--:-- --:
1:22:54 PM: --:-- --:--:--   397
1:22:54 PM: 
100   609    0   609    0     0   1013      0 --:--:-- --:--:-- --:--:--  1013
1:22:54 PM: 
 82 1213k   82 1002k    0     0   981k      0  0:00:01
1:22:54 PM: 0:00:01 --:--:--  981k
1:22:54 PM: 
100 1213k  100 1213k    0     0  1186
1:22:54 PM: k      0  0:00:01  0:00:01 --:--:--  205M
1:22:54 PM: [2/2]: https://yarnpkg.com/downloads/1.17.0/yarn-v1
1:22:54 PM: .17.0.tar.gz.asc --> /tmp/yarn.tar.gz.pHIYE4bktF.asc
1:22:55 PM: 
100    97  100    97    0     0   1971      0 --:--:-- --
1:22:55 PM: :--:-- --:--:--  1971
1:22:55 PM: 
100   613    0   613    0     0   3088      0 --:--:-- --:--:-- --:--:--  3
1:22:55 PM: 088
1:22:55 PM: 
100   832  100   832    0     0   3449      0 --:--:-- --:--:-- --:--:--  3449
1:22:55 PM: > Verifying integrity...
1:22:55 PM: gpg: Signature made Fri 14 Jun 2019 06:55:58 PM UTC using RSA key ID 69475BAA
1:22:55 PM: gpg: Good signature from "Yarn Packaging <yarn@dan.cx>"
1:22:55 PM: gpg: WARNING: This key is not certified with a trusted signature!
1:22:55 PM: gpg:          There is no indication that the signature belongs to the owner.
1:22:55 PM: Primary key fingerprint: 72EC F46A 56B4 AD39 C907  BBB7 1646 B01B 86E5 0310
1:22:55 PM:      Subkey fingerprint: 6D98 490C 6F1A CDDD 448E  4595 4F77 6793 6947 5BAA
1:22:55 PM: > GPG signature looks good
1:22:55 PM: > Extracting to ~/.yarn...
1:22:55 PM: > Adding to $PATH...
1:22:55 PM: > Successfully installed Yarn 1.17.0! Please open another terminal where the `yarn` command will now be available.
1:22:56 PM: Installing NPM modules using Yarn version 1.17.0
1:22:56 PM: yarn install v1.17.0
1:22:57 PM: [1/4] Resolving packages...
1:22:58 PM: [2/4] Fetching packages...
1:27:05 PM: info There appears to be trouble with your network connection. Retrying...
1:27:47 PM: info There appears to be trouble with your network connection. Retrying...
1:27:55 PM: info There appears to be trouble with your network connection. Retrying...
1:29:26 PM: info fsevents@1.2.9: The platform "linux" is incompatible with this module.
1:29:26 PM: info "fsevents@1.2.9" is an optional dependency and failed compatibility check. Excluding it from installation.
1:29:26 PM: warning bigbrother-webpack-plugin@1.7.2: The engine "install-alinode" appears to be invalid.
1:29:26 PM: info fsevents@2.1.0: The platform "linux" is incompatible with this module.
1:29:26 PM: info "fsevents@2.1.0" is an optional dependency and failed compatibility check. Excluding it from installation.
1:29:27 PM: [3/4] Linking dependencies...
1:29:27 PM: warning "umi-plugin-react > umi-plugin-dva > babel-plugin-dva-hmr@0.4.2" has unmet peer dependency "redbox-react@1.x".
1:29:27 PM: warning "umi-plugin-react > umi-plugin-dva > dva@2.6.0-beta.6" has incorrect peer dependency "react@^16.18.4".
1:29:27 PM: warning "umi-plugin-react > umi-plugin-dva > dva@2.6.0-beta.6" has incorrect peer dependency "react-dom@^16.18.4".
1:29:27 PM: warning "umi-plugin-react > umi-plugin-dva > dva-loading@3.0.6" has unmet peer dependency "dva-core@^1.1.0 | ^1.5.0-0 | ^1.6.0-0".
1:29:27 PM: warning "umi-plugin-react > umi-plugin-dva > dva > connected-react-router@6.5.2" has unmet peer dependency "react-router@^4.3.1 || ^5.0.0".
1:29:27 PM: warning "atool-build > friendly-errors-webpack-plugin@1.7.0" has incorrect peer dependency "webpack@^2.0.0 || ^3.0.0 || ^4.0.0".
1:29:27 PM: warning "umi > umi-build-dev > af-webpack > eslint-config-umi@1.6.0-beta.1" has incorrect peer dependency "eslint-plugin-react-hooks@1.5.0".
1:29:27 PM: warning "umi > umi-build-dev > af-webpack > eslint-config-umi > eslint-config-react-app@4.0.1" has unmet peer dependency "@typescript-eslint/eslint-plugin@1.x".
1:29:27 PM: warning "umi > umi-build-dev > af-webpack > eslint-config-umi > eslint-config-react-app@4.0.1" has unmet peer dependency "@typescript-eslint/parser@1.x".
1:29:27 PM: warning "umi > umi-build-dev > sylvanas > @umijs/fabric > @typescript-eslint/eslint-plugin@1.13.0" has incorrect peer dependency "@typescript-eslint/parser@^1.9.0".
1:29:27 PM: warning "umi > umi-build-dev > sylvanas > @umijs/fabric > eslint-config-airbnb@17.1.1" has incorrect peer dependency "eslint-plugin-react@^7.14.2".
1:29:27 PM: warning "umi > umi-build-dev > sylvanas > @umijs/fabric > @typescript-eslint/eslint-plugin > tsutils@3.17.1" has unmet peer dependency "typescript@>=2.8.0 || >= 3.2.0-dev || >= 3.3.0-dev || >= 3.4.0-dev || >= 3.5.0-dev || >= 3.6.0-dev || >= 3.6.0-beta || >= 3.7.0-dev || >= 3.7.0-beta".
1:29:53 PM: [4/4] Building fresh packages...
1:30:02 PM: Done in 425.10s.
1:30:02 PM: NPM modules installed using Yarn
1:30:02 PM: Started restoring cached go cache
1:30:02 PM: Finished restoring cached go cache
1:30:02 PM: unset GOOS;
1:30:02 PM: unset GOARCH;
1:30:02 PM: export GOROOT='/opt/buildhome/.gimme/versions/go1.12.linux.amd64';
1:30:02 PM: export PATH="/opt/buildhome/.gimme/versions/go1.12.linux.amd64/bin:${PATH}";
1:30:02 PM: go version >&2;
1:30:02 PM: export GIMME_ENV='/opt/buildhome/.gimme/env/go1.12.linux.amd64.env';
1:30:02 PM: go version go1.12 linux/amd64
1:30:02 PM: Installing missing commands
1:30:02 PM: Verify run directory
1:30:02 PM: Executing user command: yarn && npm run build
1:30:02 PM: yarn install v1.17.0
1:30:03 PM: [1/4] Resolving packages...
1:30:04 PM: success Already up-to-date.
1:30:04 PM: Done in 1.38s.
1:30:04 PM: > landing-page@1.0.0 build /opt/build/repo/front-end/landing-page
1:30:04 PM: > umi build
1:30:07 PM: ● Webpack █████████████████████████ compiling (0%)
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1:30:08 PM:  css-loader › postcss-loader › less-loader › src/global.less
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1:30:27 PM:   Compiled successfully in 19.84s
1:30:27 PM:  DONE  Compiled successfully in 19845ms5:30:27 AM
1:30:27 PM: File sizes after gzip:
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1:30:27 PM:   19.19 KB  dist/umi.css
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1:31:11 PM: Finished processing build request in 8m23.489269357s

Hi there,

I would suspect that yarn’s CDN had network problems then. When I search all of our logs for those errors, they happen occasionally to many people, but rarely constantly. Do you see it reliably/repeatably, on builds on different days?