diff --git a/package-lock.json b/package-lock.json
index fcf2e62..0548853 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -1113,6 +1113,12 @@
       "integrity": "sha512-tMUqwBWfLFbJbizRmEcWSLw6HnFzfdJs2sOJEOwwtVPMoH/0Ay+E703oZz78VSXZiiDcZrQ5XKjPIUQixhmgVw==",
       "dev": true
     },
+    "acorn-walk": {
+      "version": "6.2.0",
+      "resolved": "https://registry.npmjs.org/acorn-walk/-/acorn-walk-6.2.0.tgz",
+      "integrity": "sha512-7evsyfH1cLOCdAzZAd43Cic04yKydNx0cF+7tiA19p1XnLLPU4dpCQOqpjqwokFe//vS0QqfqqjCS2JkiIs0cA==",
+      "dev": true
+    },
     "agent-base": {
       "version": "4.3.0",
       "resolved": "https://registry.npmjs.org/agent-base/-/agent-base-4.3.0.tgz",
@@ -1512,22 +1518,6 @@
       "integrity": "sha512-Uvq6hVe90D0B2WEnUqtdgY1bATGz3mw33nH9Y+dmA+w5DHvUmBgkr5rM/KCHpCsiFNRUfokW/szpPPgMK2hm4A==",
       "dev": true
     },
-    "axios": {
-      "version": "0.18.1",
-      "resolved": "https://registry.npmjs.org/axios/-/axios-0.18.1.tgz",
-      "integrity": "sha512-0BfJq4NSfQXd+SkFdrvFbG7addhYSBA2mQwISr46pD6E5iqkWg02RAs8vyTT/j0RTnoYmeXauBuSv1qKwR179g==",
-      "requires": {
-        "follow-redirects": "1.5.10",
-        "is-buffer": "^2.0.2"
-      },
-      "dependencies": {
-        "is-buffer": {
-          "version": "2.0.4",
-          "resolved": "https://registry.npmjs.org/is-buffer/-/is-buffer-2.0.4.tgz",
-          "integrity": "sha512-Kq1rokWXOPXWuaMAqZiJW4XxsmD9zGx9q4aePabbn3qCRGedtH7Cm+zV8WETitMfu1wdh+Rvd6w5egwSngUX2A=="
-        }
-      }
-    },
     "axobject-query": {
       "version": "2.1.1",
       "resolved": "https://registry.npmjs.org/axobject-query/-/axobject-query-2.1.1.tgz",
@@ -1643,6 +1633,18 @@
         "tweetnacl": "^0.14.3"
       }
     },
+    "bfj": {
+      "version": "6.1.2",
+      "resolved": "https://registry.npmjs.org/bfj/-/bfj-6.1.2.tgz",
+      "integrity": "sha512-BmBJa4Lip6BPRINSZ0BPEIfB1wUY/9rwbwvIHQA1KjX9om29B6id0wnWXq7m3bn5JrUVjeOTnVuhPT1FiHwPGw==",
+      "dev": true,
+      "requires": {
+        "bluebird": "^3.5.5",
+        "check-types": "^8.0.3",
+        "hoopy": "^0.1.4",
+        "tryer": "^1.0.1"
+      }
+    },
     "big.js": {
       "version": "3.2.0",
       "resolved": "https://registry.npmjs.org/big.js/-/big.js-3.2.0.tgz",
@@ -1988,6 +1990,12 @@
       "integrity": "sha512-mT8iDcrh03qDGRRmoA2hmBJnxpllMR+0/0qlzjqZES6NdiWDcZkCNAk4rPFZ9Q85r27unkiNNg8ZOiwZXBHwcA==",
       "dev": true
     },
+    "check-types": {
+      "version": "8.0.3",
+      "resolved": "https://registry.npmjs.org/check-types/-/check-types-8.0.3.tgz",
+      "integrity": "sha512-YpeKZngUmG65rLudJ4taU7VLkOCTMhNl/u4ctNC56LQS/zJTyNH0Lrtwm1tfTsbLlwvlfsA2d1c8vCf/Kh2KwQ==",
+      "dev": true
+    },
     "chokidar": {
       "version": "2.1.8",
       "resolved": "https://registry.npmjs.org/chokidar/-/chokidar-2.1.8.tgz",
@@ -2400,6 +2408,7 @@
       "version": "3.1.0",
       "resolved": "https://registry.npmjs.org/debug/-/debug-3.1.0.tgz",
       "integrity": "sha512-OX8XqP7/1a9cqkxYw2yXss15f26NKWBpDXQd0/uK/KPqdQhxbPa994hnzjcE2VqQpDslf55723cKPUOGSmMY3g==",
+      "dev": true,
       "requires": {
         "ms": "2.0.0"
       }
@@ -2546,6 +2555,12 @@
       "integrity": "sha512-jnjyiM6eRyZl2H+W8Q/zLMA481hzi0eszAaBUzIVnmYVDBbnLxVNnfu1HgEBvCbL+71FrxMl3E6lpKH7Ge3OXA==",
       "dev": true
     },
+    "duplexer": {
+      "version": "0.1.1",
+      "resolved": "https://registry.npmjs.org/duplexer/-/duplexer-0.1.1.tgz",
+      "integrity": "sha1-rOb/gIwc5mtX0ev5eXessCM0z8E=",
+      "dev": true
+    },
     "duplexify": {
       "version": "3.7.1",
       "resolved": "https://registry.npmjs.org/duplexify/-/duplexify-3.7.1.tgz",
@@ -2574,6 +2589,12 @@
       "integrity": "sha1-WQxhFWsK4vTwJVcyoViyZrxWsh0=",
       "dev": true
     },
+    "ejs": {
+      "version": "2.7.4",
+      "resolved": "https://registry.npmjs.org/ejs/-/ejs-2.7.4.tgz",
+      "integrity": "sha512-7vmuyh5+kuUyJKePhQfRQBhXV5Ce+RnaeeQArKu1EAMpL3WbgMt5WG6uQZpEVvYSSsxMXRKOewtDk9RaTKXRlA==",
+      "dev": true
+    },
     "electron-to-chromium": {
       "version": "1.3.322",
       "resolved": "https://registry.npmjs.org/electron-to-chromium/-/electron-to-chromium-1.3.322.tgz",
@@ -3399,6 +3420,12 @@
       "dev": true,
       "optional": true
     },
+    "filesize": {
+      "version": "3.6.1",
+      "resolved": "https://registry.npmjs.org/filesize/-/filesize-3.6.1.tgz",
+      "integrity": "sha512-7KjR1vv6qnicaPMi1iiTcI85CyYwRO/PSFCu6SvqL8jN2Wjt/NIYQTFtFs7fSDCYOstUkEWIQGFUg5YZQfjlcg==",
+      "dev": true
+    },
     "fill-range": {
       "version": "4.0.0",
       "resolved": "https://registry.npmjs.org/fill-range/-/fill-range-4.0.0.tgz",
@@ -3592,14 +3619,6 @@
         "readable-stream": "^2.3.6"
       }
     },
-    "follow-redirects": {
-      "version": "1.5.10",
-      "resolved": "https://registry.npmjs.org/follow-redirects/-/follow-redirects-1.5.10.tgz",
-      "integrity": "sha512-0V5l4Cizzvqt5D44aTXbFZz+FtyXV1vrDN6qrelxtfYQKW0KO0W2T/hkE8xvGa/540LkZlkaUjO4ailYTFtHVQ==",
-      "requires": {
-        "debug": "=3.1.0"
-      }
-    },
     "for-in": {
       "version": "1.0.2",
       "resolved": "https://registry.npmjs.org/for-in/-/for-in-1.0.2.tgz",
@@ -4360,6 +4379,24 @@
       "integrity": "sha512-qBr4OuELkhPenW6goKVXiv47US3clb3/IbuWF9KNKEijAy9oeHxU9IgzjvJhHkUzhaj7rOUD7+YGWqUjLp5oSA==",
       "dev": true
     },
+    "gzip-size": {
+      "version": "5.1.1",
+      "resolved": "https://registry.npmjs.org/gzip-size/-/gzip-size-5.1.1.tgz",
+      "integrity": "sha512-FNHi6mmoHvs1mxZAds4PpdCS6QG8B4C1krxJsMutgxl5t3+GlRTzzI3NEkifXx2pVsOvJdOGSmIgDhQ55FwdPA==",
+      "dev": true,
+      "requires": {
+        "duplexer": "^0.1.1",
+        "pify": "^4.0.1"
+      },
+      "dependencies": {
+        "pify": {
+          "version": "4.0.1",
+          "resolved": "https://registry.npmjs.org/pify/-/pify-4.0.1.tgz",
+          "integrity": "sha512-uB80kBFb/tfd68bVleG9T5GGsGPjJrLAUpR5PZIrhBnIaRTQRjqdJSsIKkOP6OAIFbj7GOrcudc5pNjZ+geV2g==",
+          "dev": true
+        }
+      }
+    },
     "har-schema": {
       "version": "2.0.0",
       "resolved": "https://registry.npmjs.org/har-schema/-/har-schema-2.0.0.tgz",
@@ -4475,6 +4512,12 @@
         "parse-passwd": "^1.0.0"
       }
     },
+    "hoopy": {
+      "version": "0.1.4",
+      "resolved": "https://registry.npmjs.org/hoopy/-/hoopy-0.1.4.tgz",
+      "integrity": "sha512-HRcs+2mr52W0K+x8RzcLzuPPmVIKMSv97RGHy0Ea9y/mpcaK+xTrjICA04KAHi4GRzxliNqNJEFYWHghy3rSfQ==",
+      "dev": true
+    },
     "hosted-git-info": {
       "version": "2.7.1",
       "resolved": "https://registry.npmjs.org/hosted-git-info/-/hosted-git-info-2.7.1.tgz",
@@ -5233,7 +5276,7 @@
     },
     "media-typer": {
       "version": "0.3.0",
-      "resolved": "https://registry.npmjs.org/media-typer/-/media-typer-0.3.0.tgz",
+      "resolved": "http://registry.npmjs.org/media-typer/-/media-typer-0.3.0.tgz",
       "integrity": "sha1-hxDXrwqmJvj/+hzgAWhUUmMlV0g=",
       "dev": true
     },
@@ -5478,7 +5521,8 @@
     "ms": {
       "version": "2.0.0",
       "resolved": "https://registry.npmjs.org/ms/-/ms-2.0.0.tgz",
-      "integrity": "sha1-VgiurfwAvmwpAd9fmGF4jeDVl8g="
+      "integrity": "sha1-VgiurfwAvmwpAd9fmGF4jeDVl8g=",
+      "dev": true
     },
     "mute-stream": {
       "version": "0.0.7",
@@ -5536,6 +5580,11 @@
       "integrity": "sha512-1nh45deeb5olNY7eX82BkPO7SSxR5SSYJiPTrTdFUVYwAl8CKMA5N9PjTYkHiRjisVcxcQ1HXdLhx2qxxJzLNQ==",
       "dev": true
     },
+    "node-fetch": {
+      "version": "2.6.0",
+      "resolved": "https://registry.npmjs.org/node-fetch/-/node-fetch-2.6.0.tgz",
+      "integrity": "sha512-8dG4H5ujfvFiqDmVu9fQ5bOHUC15JMjMY/Zumv26oOvvVJjM67KF8koCWIabKQ1GJIa9r2mMZscBq/TbdOcmNA=="
+    },
     "node-libs-browser": {
       "version": "2.2.1",
       "resolved": "https://registry.npmjs.org/node-libs-browser/-/node-libs-browser-2.2.1.tgz",
@@ -6990,6 +7039,12 @@
       "resolved": "https://registry.npmjs.org/opencollective-postinstall/-/opencollective-postinstall-2.0.2.tgz",
       "integrity": "sha512-pVOEP16TrAO2/fjej1IdOyupJY8KDUM1CvsaScRbw6oddvpQoOfGk4ywha0HKKVAD6RkW4x6Q+tNBwhf3Bgpuw=="
     },
+    "opener": {
+      "version": "1.5.1",
+      "resolved": "https://registry.npmjs.org/opener/-/opener-1.5.1.tgz",
+      "integrity": "sha512-goYSy5c2UXE4Ra1xixabeVh1guIX/ZV/YokJksb6q2lubWu6UbvPQ20p542/sFIll1nl8JnCyK9oBaOcCWXwvA==",
+      "dev": true
+    },
     "optionator": {
       "version": "0.8.3",
       "resolved": "https://registry.npmjs.org/optionator/-/optionator-0.8.3.tgz",
@@ -7870,7 +7925,7 @@
     },
     "safe-regex": {
       "version": "1.1.0",
-      "resolved": "https://registry.npmjs.org/safe-regex/-/safe-regex-1.1.0.tgz",
+      "resolved": "http://registry.npmjs.org/safe-regex/-/safe-regex-1.1.0.tgz",
       "integrity": "sha1-QKNmnzsHfR6UPURinhV91IAjvy4=",
       "dev": true,
       "requires": {
@@ -8446,7 +8501,7 @@
     },
     "strip-eof": {
       "version": "1.0.0",
-      "resolved": "https://registry.npmjs.org/strip-eof/-/strip-eof-1.0.0.tgz",
+      "resolved": "http://registry.npmjs.org/strip-eof/-/strip-eof-1.0.0.tgz",
       "integrity": "sha1-u0P/VZim6wXYm1n80SnJgzE2Br8=",
       "dev": true
     },
@@ -8757,6 +8812,12 @@
         }
       }
     },
+    "tryer": {
+      "version": "1.0.1",
+      "resolved": "https://registry.npmjs.org/tryer/-/tryer-1.0.1.tgz",
+      "integrity": "sha512-c3zayb8/kWWpycWYg87P71E1S1ZL6b6IJxfb5fvsUgsf0S2MVGaDhDXXjDMpdCpfWXqptc+4mXwmiy1ypXqRAA==",
+      "dev": true
+    },
     "tslib": {
       "version": "1.10.0",
       "resolved": "https://registry.npmjs.org/tslib/-/tslib-1.10.0.tgz",
@@ -9121,6 +9182,27 @@
         }
       }
     },
+    "webpack-bundle-analyzer": {
+      "version": "3.6.0",
+      "resolved": "https://registry.npmjs.org/webpack-bundle-analyzer/-/webpack-bundle-analyzer-3.6.0.tgz",
+      "integrity": "sha512-orUfvVYEfBMDXgEKAKVvab5iQ2wXneIEorGNsyuOyVYpjYrI7CUOhhXNDd3huMwQ3vNNWWlGP+hzflMFYNzi2g==",
+      "dev": true,
+      "requires": {
+        "acorn": "^6.0.7",
+        "acorn-walk": "^6.1.1",
+        "bfj": "^6.1.1",
+        "chalk": "^2.4.1",
+        "commander": "^2.18.0",
+        "ejs": "^2.6.1",
+        "express": "^4.16.3",
+        "filesize": "^3.6.1",
+        "gzip-size": "^5.0.0",
+        "lodash": "^4.17.15",
+        "mkdirp": "^0.5.1",
+        "opener": "^1.5.1",
+        "ws": "^6.0.0"
+      }
+    },
     "webpack-cli": {
       "version": "3.3.10",
       "resolved": "https://registry.npmjs.org/webpack-cli/-/webpack-cli-3.3.10.tgz",
diff --git a/package.json b/package.json
index e105f2b..e04899d 100644
--- a/package.json
+++ b/package.json
@@ -9,6 +9,8 @@
   "scripts": {
     "start": "node scripts/server.js",
     "build": "rimraf dist && webpack --config scripts/webpack.config.prod.js",
+    "profile:tesseract": "webpack-bundle-analyzer dist/tesseract-stats.json",
+    "profile:worker": "webpack-bundle-analyzer dist/worker-stats.json",
     "prepublishOnly": "npm run build",
     "wait": "rimraf dist && wait-on http://localhost:3000/dist/tesseract.dev.js",
     "test": "npm-run-all -p -r start test:all",
@@ -50,15 +52,16 @@
     "rimraf": "^2.7.1",
     "wait-on": "^3.3.0",
     "webpack": "^4.41.4",
+    "webpack-bundle-analyzer": "^3.6.0",
     "webpack-cli": "^3.3.10",
     "webpack-dev-middleware": "^3.7.2"
   },
   "dependencies": {
-    "axios": "^0.18.0",
     "bmp-js": "^0.1.0",
     "file-type": "^12.4.1",
     "idb-keyval": "^3.2.0",
     "is-url": "1.2.2",
+    "node-fetch": "^2.6.0",
     "opencollective-postinstall": "^2.0.2",
     "regenerator-runtime": "^0.13.3",
     "resolve-url": "^0.2.1",
diff --git a/scripts/webpack.config.dev.js b/scripts/webpack.config.dev.js
index 4ae782a..f2a3181 100644
--- a/scripts/webpack.config.dev.js
+++ b/scripts/webpack.config.dev.js
@@ -1,5 +1,6 @@
 const path = require('path');
 const webpack = require('webpack');
+const { BundleAnalyzerPlugin } = require('webpack-bundle-analyzer');
 const common = require('./webpack.config.common');
 
 const genConfig = ({
@@ -19,6 +20,11 @@ const genConfig = ({
         TESS_ENV: JSON.stringify('development'),
       },
     }),
+    new BundleAnalyzerPlugin({
+      analyzerMode: 'disable',
+      statsFilename: `${filename.split('.')[0]}-stats.json`,
+      generateStatsFile: true
+    }),
   ],
   devServer: {
     allowedHosts: ['localhost', '.gitpod.io'],
diff --git a/src/utils/getEnvironment.js b/src/utils/getEnvironment.js
index 71b1c01..c7bee8f 100644
--- a/src/utils/getEnvironment.js
+++ b/src/utils/getEnvironment.js
@@ -1,10 +1,17 @@
 module.exports = (key) => {
-  const env = {
-    type: (typeof window !== 'undefined') && (typeof window.document !== 'undefined') ? 'browser' : 'node',
-  };
+  const env = {};
+
+  if (typeof window === 'object') {
+    env.type = 'browser';
+  } else if (typeof importScripts === 'function') {
+    env.type = 'webworker';
+  } else if (typeof process === 'object' && typeof require === 'function') {
+    env.type = 'node';
+  }
 
   if (typeof key === 'undefined') {
     return env;
   }
+
   return env[key];
 };
diff --git a/src/worker-script/browser/index.js b/src/worker-script/browser/index.js
index 3199996..06fd336 100644
--- a/src/worker-script/browser/index.js
+++ b/src/worker-script/browser/index.js
@@ -27,5 +27,6 @@ global.addEventListener('message', ({ data }) => {
 worker.setAdapter({
   getCore,
   gunzip,
+  fetch: () => {},
   ...cache,
 });
diff --git a/src/worker-script/index.js b/src/worker-script/index.js
index 56cdb4f..074c2dd 100644
--- a/src/worker-script/index.js
+++ b/src/worker-script/index.js
@@ -9,10 +9,9 @@
  */
 require('regenerator-runtime/runtime');
 const fileType = require('file-type');
-const axios = require('axios');
 const isURL = require('is-url');
 const dump = require('./utils/dump');
-const isBrowser = require('../utils/getEnvironment')('type') === 'browser';
+const isWebWorker = require('../utils/getEnvironment')('type') === 'webworker';
 const setImage = require('./utils/setImage');
 const defaultParams = require('./constants/defaultParams');
 const { log, setLogging } = require('../utils/log');
@@ -94,11 +93,8 @@ const loadLanguage = async ({
         }
 
         if (path !== null) {
-          const { data: _data } = await axios.get(
-            `${path}/${lang}.traineddata${gzip ? '.gz' : ''}`,
-            { responseType: 'arraybuffer' },
-          );
-          data = _data;
+          const resp = await (isWebWorker ? fetch : adapter.fetch)(`${path}/${lang}.traineddata${gzip ? '.gz' : ''}`);
+          data = await resp.arrayBuffer();
         } else {
           data = await adapter.readCache(`${langPath}/${lang}.traineddata${gzip ? '.gz' : ''}`);
         }
diff --git a/src/worker-script/node/index.js b/src/worker-script/node/index.js
index 0c24204..ded8f68 100644
--- a/src/worker-script/node/index.js
+++ b/src/worker-script/node/index.js
@@ -8,6 +8,7 @@
  * @author Jerome Wu <jeromewus@gmail.com>
  */
 
+const fetch = require('node-fetch');
 const worker = require('../');
 const getCore = require('./getCore');
 const gunzip = require('./gunzip');
@@ -23,5 +24,6 @@ process.on('message', (packet) => {
 worker.setAdapter({
   getCore,
   gunzip,
+  fetch,
   ...cache,
 });
diff --git a/src/worker/browser/loadImage.js b/src/worker/browser/loadImage.js
index 864eede..675dc2e 100644
--- a/src/worker/browser/loadImage.js
+++ b/src/worker/browser/loadImage.js
@@ -1,4 +1,3 @@
-const axios = require('axios');
 const resolveURL = require('resolve-url');
 
 /**
@@ -41,8 +40,8 @@ const loadImage = async (image) => {
         .split('')
         .map(c => c.charCodeAt(0));
     } else {
-      const { data: _data } = await axios.get(resolveURL(image), { responseType: 'arraybuffer' });
-      data = _data;
+      const resp = await fetch(resolveURL(image));
+      data = await resp.arrayBuffer();
     }
   } else if (image instanceof HTMLElement) {
     if (image.tagName === 'IMG') {
diff --git a/src/worker/node/loadImage.js b/src/worker/node/loadImage.js
index 96f7734..0b5a660 100644
--- a/src/worker/node/loadImage.js
+++ b/src/worker/node/loadImage.js
@@ -1,6 +1,6 @@
 const util = require('util');
 const fs = require('fs');
-const axios = require('axios');
+const fetch = require('node-fetch');
 const isURL = require('is-url');
 
 const readFile = util.promisify(fs.readFile);
@@ -20,8 +20,8 @@ module.exports = async (image) => {
 
   if (typeof image === 'string') {
     if (isURL(image) || image.startsWith('moz-extension://') || image.startsWith('chrome-extension://') || image.startsWith('file://')) {
-      const { data: _data } = await axios.get(image, { responseType: 'arraybuffer' });
-      data = _data;
+      const resp = await fetch(image);
+      data = await resp.arrayBuffer();
     } else if (/data:image\/([a-zA-Z]*);base64,([^"]*)/.test(image)) {
       data = Buffer.from(image.split(',')[1], 'base64');
     } else {