diff --git a/.github/workflows/size-limit.yml b/.github/workflows/size-limit.yml
new file mode 100644
index 000000000..0c71ddf25
--- /dev/null
+++ b/.github/workflows/size-limit.yml
@@ -0,0 +1,16 @@
+name: 'size'
+on:
+  pull_request:
+    branches:
+      - master
+jobs:
+  size:
+    runs-on: ubuntu-latest
+    env:
+      CI_JOB_NUMBER: 1
+    steps:
+      - uses: actions/checkout@v1
+      - uses: andresz1/size-limit-action@v1
+        with:
+          github_token: ${{ secrets.GITHUB_TOKEN }}
+          build_script: build:prod
diff --git a/.size-limit.js b/.size-limit.js
new file mode 100644
index 000000000..437aed6cd
--- /dev/null
+++ b/.size-limit.js
@@ -0,0 +1,134 @@
+module.exports = [
+  {
+    path: 'package/swiper-bundle.js',
+    name: 'bundle',
+    limit: '40 KB',
+  },
+  {
+    path: 'package/swiper.esm.js',
+    name: 'ESM bundle',
+    import:
+      'SwiperCore, { Navigation, Pagination, Virtual, Keyboard, Mousewheel, Scrollbar, Parallax, Zoom, Lazy, Controller, A11y, History, HashNavigation, Autoplay, EffectFade, EffectCube, EffectFlip, EffectCoverflow, Thumbs }',
+    limit: '40 KB',
+  },
+  {
+    path: 'package/swiper.esm.js',
+    name: 'Core',
+    import: 'SwiperCore',
+    limit: '20 KB',
+  },
+  {
+    path: 'package/swiper.esm.js',
+    name: 'Navigation',
+    import: '{ Navigation }',
+    limit: '5 KB',
+  },
+  {
+    path: 'package/swiper.esm.js',
+    name: 'Pagination',
+    import: '{ Pagination }',
+    limit: '7 KB',
+  },
+  {
+    path: 'package/swiper.esm.js',
+    name: 'Virtual',
+    import: '{ Virtual }',
+    limit: '6 KB',
+  },
+  {
+    path: 'package/swiper.esm.js',
+    name: 'Keyboard',
+    import: '{ Keyboard }',
+    limit: '5 KB',
+  },
+  {
+    path: 'package/swiper.esm.js',
+    name: 'Mousewheel',
+    import: '{ Mousewheel }',
+    limit: '7 KB',
+  },
+  {
+    path: 'package/swiper.esm.js',
+    name: 'Scrollbar',
+    import: '{ Scrollbar }',
+    limit: '7 KB',
+  },
+  {
+    path: 'package/swiper.esm.js',
+    name: 'Parallax',
+    import: '{ Parallax }',
+    limit: '8 KB',
+  },
+  {
+    path: 'package/swiper.esm.js',
+    name: 'Zoom',
+    import: '{ Zoom }',
+    limit: '7 KB',
+  },
+  {
+    path: 'package/swiper.esm.js',
+    name: 'Lazy',
+    import: '{ Lazy }',
+    limit: '7 KB',
+  },
+  {
+    path: 'package/swiper.esm.js',
+    name: 'Controller',
+    import: '{ Controller }',
+    limit: '2 KB',
+  },
+  {
+    path: 'package/swiper.esm.js',
+    name: 'A11y',
+    import: '{ A11y }',
+    limit: '7 KB',
+  },
+  {
+    path: 'package/swiper.esm.js',
+    name: 'History',
+    import: '{ History }',
+    limit: '3 KB',
+  },
+  {
+    path: 'package/swiper.esm.js',
+    name: 'HashNavigation',
+    import: '{ HashNavigation }',
+    limit: '6 KB',
+  },
+  {
+    path: 'package/swiper.esm.js',
+    name: 'Autoplay',
+    import: '{ Autoplay }',
+    limit: '3 KB',
+  },
+  {
+    path: 'package/swiper.esm.js',
+    name: 'EffectFade',
+    import: '{ EffectFade }',
+    limit: '2 KB',
+  },
+  {
+    path: 'package/swiper.esm.js',
+    name: 'EffectCube',
+    import: '{ EffectCube }',
+    limit: '7 KB',
+  },
+  {
+    path: 'package/swiper.esm.js',
+    name: 'EffectFlip',
+    import: '{ EffectFlip }',
+    limit: '7 KB',
+  },
+  {
+    path: 'package/swiper.esm.js',
+    name: 'EffectCoverflow',
+    import: '{ EffectCoverflow }',
+    limit: '7 KB',
+  },
+  {
+    path: 'package/swiper.esm.js',
+    name: 'Thumbs',
+    import: '{ Thumbs }',
+    limit: '7 KB',
+  },
+];
diff --git a/package-lock.json b/package-lock.json
index c4a124283..94bdcabb9 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -4796,6 +4796,12 @@
         "read-package-json-fast": "^1.1.3"
       }
     },
+    "@polka/url": {
+      "version": "1.0.0-next.11",
+      "resolved": "https://registry.npmjs.org/@polka/url/-/url-1.0.0-next.11.tgz",
+      "integrity": "sha512-3NsZsJIA/22P3QUyrEDNA2D133H4j224twJrdipXN38dpnIOzAbUDtOwkcJ5pXmn75w7LSQDjA4tO9dm1XlqlA==",
+      "dev": true
+    },
     "@rollup/plugin-babel": {
       "version": "5.2.2",
       "resolved": "https://registry.npmjs.org/@rollup/plugin-babel/-/plugin-babel-5.2.2.tgz",
@@ -4971,20 +4977,520 @@
             "yallist": "^4.0.0"
           }
         },
-        "semver": {
-          "version": "7.3.4",
-          "resolved": "https://registry.npmjs.org/semver/-/semver-7.3.4.tgz",
-          "integrity": "sha512-tCfb2WLjqFAtXn4KEdxIhalnRtoKFN7nAwj0B3ZXCbQloV2tq5eDbcTmT68JJD3nRJq24/XgxtQKFIpQdtvmVw==",
+        "semver": {
+          "version": "7.3.4",
+          "resolved": "https://registry.npmjs.org/semver/-/semver-7.3.4.tgz",
+          "integrity": "sha512-tCfb2WLjqFAtXn4KEdxIhalnRtoKFN7nAwj0B3ZXCbQloV2tq5eDbcTmT68JJD3nRJq24/XgxtQKFIpQdtvmVw==",
+          "dev": true,
+          "requires": {
+            "lru-cache": "^6.0.0"
+          }
+        },
+        "yallist": {
+          "version": "4.0.0",
+          "resolved": "https://registry.npmjs.org/yallist/-/yallist-4.0.0.tgz",
+          "integrity": "sha512-3wdGidZyq5PB084XLES5TpOSRA3wjXAlIWMhum2kRcv/41Sn2emQ0dycQW4uZXLejwKvg6EsvbdlVL+FYEct7A==",
+          "dev": true
+        }
+      }
+    },
+    "@size-limit/file": {
+      "version": "4.9.2",
+      "resolved": "https://registry.npmjs.org/@size-limit/file/-/file-4.9.2.tgz",
+      "integrity": "sha512-jMFbIvY1bLbirjsPpP4fN8/H3EZGML77NTrP0r5rFGKZMFMz+KbQJa4kEzO/OrKQSSJLi6WpOh+xQPOSR1U4PQ==",
+      "dev": true,
+      "requires": {
+        "semver": "7.3.4"
+      },
+      "dependencies": {
+        "lru-cache": {
+          "version": "6.0.0",
+          "resolved": "https://registry.npmjs.org/lru-cache/-/lru-cache-6.0.0.tgz",
+          "integrity": "sha512-Jo6dJ04CmSjuznwJSS3pUeWmd/H0ffTlkXXgwZi+eq1UCmqQwCh+eLsYOYCwY991i2Fah4h1BEMCx4qThGbsiA==",
+          "dev": true,
+          "requires": {
+            "yallist": "^4.0.0"
+          }
+        },
+        "semver": {
+          "version": "7.3.4",
+          "resolved": "https://registry.npmjs.org/semver/-/semver-7.3.4.tgz",
+          "integrity": "sha512-tCfb2WLjqFAtXn4KEdxIhalnRtoKFN7nAwj0B3ZXCbQloV2tq5eDbcTmT68JJD3nRJq24/XgxtQKFIpQdtvmVw==",
+          "dev": true,
+          "requires": {
+            "lru-cache": "^6.0.0"
+          }
+        },
+        "yallist": {
+          "version": "4.0.0",
+          "resolved": "https://registry.npmjs.org/yallist/-/yallist-4.0.0.tgz",
+          "integrity": "sha512-3wdGidZyq5PB084XLES5TpOSRA3wjXAlIWMhum2kRcv/41Sn2emQ0dycQW4uZXLejwKvg6EsvbdlVL+FYEct7A==",
+          "dev": true
+        }
+      }
+    },
+    "@size-limit/preset-big-lib": {
+      "version": "4.9.2",
+      "resolved": "https://registry.npmjs.org/@size-limit/preset-big-lib/-/preset-big-lib-4.9.2.tgz",
+      "integrity": "sha512-GsMT9SGYId9Lshy4xcApFPJSzAkMkoWeKcIHNEePazWE1p3W2g+WImvKVoVzjVFQOTt9HUDZ8WZ71VdnnfRKAw==",
+      "dev": true,
+      "requires": {
+        "@size-limit/file": "4.9.2",
+        "@size-limit/time": "4.9.2",
+        "@size-limit/webpack": "4.9.2"
+      }
+    },
+    "@size-limit/time": {
+      "version": "4.9.2",
+      "resolved": "https://registry.npmjs.org/@size-limit/time/-/time-4.9.2.tgz",
+      "integrity": "sha512-FNuuPbSlu/9gIup2BED9wo+2VybWEBYqoeHEP1tXibYQQe+Ubo1cbf8J7/7EuJFNrdaKi7dz+AdoCKYVTyf5fQ==",
+      "dev": true,
+      "requires": {
+        "estimo": "^2.2.3",
+        "react": "^17.0.1"
+      }
+    },
+    "@size-limit/webpack": {
+      "version": "4.9.2",
+      "resolved": "https://registry.npmjs.org/@size-limit/webpack/-/webpack-4.9.2.tgz",
+      "integrity": "sha512-ldku5BDHubLX0GW2IBDquSUAE0J0AnPnH3r99hUT/gCKUlKGc/bwuH0zDpMx58XHfHHBwv9c1fODKOapsmhjIQ==",
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+      "requires": {
+        "css-loader": "^5.0.1",
+        "escape-string-regexp": "^4.0.0",
+        "file-loader": "^6.2.0",
+        "mkdirp": "^1.0.4",
+        "nanoid": "^3.1.20",
+        "optimize-css-assets-webpack-plugin": "^5.0.4",
+        "pnp-webpack-plugin": "^1.6.4",
+        "rimraf": "^3.0.2",
+        "style-loader": "^2.0.0",
+        "webpack": "^4.44.1",
+        "webpack-bundle-analyzer": "^4.4.0"
+      },
+      "dependencies": {
+        "acorn": {
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+    "tracium": {
+      "version": "0.2.1",
+      "resolved": "https://registry.npmjs.org/tracium/-/tracium-0.2.1.tgz",
+      "integrity": "sha512-ERoaMqbl9h9qxXrHIh15ZMe2MuYKSN3lXoIrkvDnlQh09Ribn3fzrCQN774ewwS/DbX1wwuipyrhOFqrp5/1qg==",
+      "dev": true,
+      "requires": {
+        "debug": "^4.1.1"
+      }
+    },
     "tree-kill": {
       "version": "1.2.2",
       "resolved": "https://registry.npmjs.org/tree-kill/-/tree-kill-1.2.2.tgz",
@@ -24254,6 +25258,28 @@
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       "dev": true
     },
+    "unbzip2-stream": {
+      "version": "1.4.3",
+      "resolved": "https://registry.npmjs.org/unbzip2-stream/-/unbzip2-stream-1.4.3.tgz",
+      "integrity": "sha512-mlExGW4w71ebDJviH16lQLtZS32VKqsSfk80GCfUlwT/4/hNRFsoscrF/c++9xinkMzECL1uL9DDwXqFWkruPg==",
+      "dev": true,
+      "requires": {
+        "buffer": "^5.2.1",
+        "through": "^2.3.8"
+      },
+      "dependencies": {
+        "buffer": {
+          "version": "5.7.1",
+          "resolved": "https://registry.npmjs.org/buffer/-/buffer-5.7.1.tgz",
+          "integrity": "sha512-EHcyIPBQ4BSGlvjB16k5KgAJ27CIsHY/2JBmCRReo48y9rQ3MaUzWX3KVlBa4U7MyX02HdVj0K7C3WaB3ju7FQ==",
+          "dev": true,
+          "requires": {
+            "base64-js": "^1.3.1",
+            "ieee754": "^1.1.13"
+          }
+        }
+      }
+    },
     "unicode-canonical-property-names-ecmascript": {
       "version": "1.0.4",
       "resolved": "https://registry.npmjs.org/unicode-canonical-property-names-ecmascript/-/unicode-canonical-property-names-ecmascript-1.0.4.tgz",
@@ -24856,6 +25882,55 @@
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       }
     },
+    "webpack-bundle-analyzer": {
+      "version": "4.4.0",
+      "resolved": "https://registry.npmjs.org/webpack-bundle-analyzer/-/webpack-bundle-analyzer-4.4.0.tgz",
+      "integrity": "sha512-9DhNa+aXpqdHk8LkLPTBU/dMfl84Y+WE2+KnfI6rSpNRNVKa0VGLjPd2pjFubDeqnWmulFggxmWBxhfJXZnR0g==",
+      "dev": true,
+      "requires": {
+        "acorn": "^8.0.4",
+        "acorn-walk": "^8.0.0",
+        "chalk": "^4.1.0",
+        "commander": "^6.2.0",
+        "gzip-size": "^6.0.0",
+        "lodash": "^4.17.20",
+        "opener": "^1.5.2",
+        "sirv": "^1.0.7",
+        "ws": "^7.3.1"
+      },
+      "dependencies": {
+        "acorn": {
+          "version": "8.0.5",
+          "resolved": "https://registry.npmjs.org/acorn/-/acorn-8.0.5.tgz",
+          "integrity": "sha512-v+DieK/HJkJOpFBETDJioequtc3PfxsWMaxIdIwujtF7FEV/MAyDQLlm6/zPvr7Mix07mLh6ccVwIsloceodlg==",
+          "dev": true
+        },
+        "acorn-walk": {
+          "version": "8.0.2",
+          "resolved": "https://registry.npmjs.org/acorn-walk/-/acorn-walk-8.0.2.tgz",
+          "integrity": "sha512-+bpA9MJsHdZ4bgfDcpk0ozQyhhVct7rzOmO0s1IIr0AGGgKBljss8n2zp11rRP2wid5VGeh04CgeKzgat5/25A==",
+          "dev": true
+        },
+        "commander": {
+          "version": "6.2.1",
+          "resolved": "https://registry.npmjs.org/commander/-/commander-6.2.1.tgz",
+          "integrity": "sha512-U7VdrJFnJgo4xjrHpTzu0yrHPGImdsmD95ZlgYSEajAn2JKzDhDTPG9kBTefmObL2w/ngeZnilk+OV9CG3d7UA==",
+          "dev": true
+        },
+        "lodash": {
+          "version": "4.17.20",
+          "resolved": "https://registry.npmjs.org/lodash/-/lodash-4.17.20.tgz",
+          "integrity": "sha512-PlhdFcillOINfeV7Ni6oF1TAEayyZBoZ8bcshTHqOYJYlrqzRK5hagpagky5o4HfCzzd1TRkXPMFq6cKk9rGmA==",
+          "dev": true
+        },
+        "ws": {
+          "version": "7.4.2",
+          "resolved": "https://registry.npmjs.org/ws/-/ws-7.4.2.tgz",
+          "integrity": "sha512-T4tewALS3+qsrpGI/8dqNMLIVdq/g/85U98HPMa6F0m6xTbvhXU6RCQLqPH3+SlomNV/LdY6RXEbBpMH6EOJnA==",
+          "dev": true
+        }
+      }
+    },
     "webpack-cli": {
       "version": "3.3.11",
       "resolved": "https://registry.npmjs.org/webpack-cli/-/webpack-cli-3.3.11.tgz",
@@ -25691,6 +26766,16 @@
         }
       }
     },
+    "yauzl": {
+      "version": "2.10.0",
+      "resolved": "https://registry.npmjs.org/yauzl/-/yauzl-2.10.0.tgz",
+      "integrity": "sha1-x+sXyT4RLLEIb6bY5R+wZnt5pfk=",
+      "dev": true,
+      "requires": {
+        "buffer-crc32": "~0.2.3",
+        "fd-slicer": "~1.1.0"
+      }
+    },
     "yeast": {
       "version": "0.1.2",
       "resolved": "https://registry.npmjs.org/yeast/-/yeast-0.1.2.tgz",
diff --git a/package.json b/package.json
index 2d5b928b7..464c26fa1 100644
--- a/package.json
+++ b/package.json
@@ -105,6 +105,7 @@
     "@rollup/plugin-babel": "^5.2.2",
     "@rollup/plugin-node-resolve": "^11.1.0",
     "@rollup/plugin-replace": "^2.3.4",
+    "@size-limit/preset-big-lib": "^4.9.2",
     "@types/express": "^4.17.11",
     "@types/jasmine": "~3.6.3",
     "@types/jasminewd2": "~2.0.8",
@@ -157,6 +158,7 @@
     "rollup": "^2.38.0",
     "rxjs": "~6.6.3",
     "serve": "^11.3.2",
+    "size-limit": "^4.9.2",
     "style-loader": "^2.0.0",
     "svelte": "^3.31.2",
     "svelte-loader": "^3.0.0",