diff --git a/jest-slow.config.cjs b/jest-slow.config.cjs
new file mode 100644
index 000000000000..9b47f45fd15b
--- /dev/null
+++ b/jest-slow.config.cjs
@@ -0,0 +1,11 @@
+// Copyright 2017-2021 @polkadot/apps authors & contributors
+// SPDX-License-Identifier: Apache-2.0
+
+const config = require('./jest.config.cjs');
+
+module.exports = {
+  ...config,
+  displayName: 'all-tests',
+  globalSetup: './jest/globalSetup.ts',
+  globalTeardown: './jest/globalTeardown.ts'
+};
diff --git a/jest.config.cjs b/jest.config.cjs
index 5a5ba8046045..3cc032fcf646 100644
--- a/jest.config.cjs
+++ b/jest.config.cjs
@@ -5,7 +5,8 @@ const config = require('@polkadot/dev/config/jest.cjs');
 
 const findPackages = require('./scripts/findPackages.cjs');
 
-const defaultConfig = {
+module.exports = {
+  ...config,
   moduleNameMapper: {
     ...(
       findPackages()
@@ -22,22 +23,7 @@ const defaultConfig = {
     '\\.(md)$': '<rootDir>/jest/mocks/empty.js'
   },
   setupFilesAfterEnv: ['<rootDir>/jest/jest-setup.ts'],
+  testEnvironment: 'jsdom',
+  testTimeout: 25000,
   transformIgnorePatterns: ['/node_modules/(?!@polkadot|@babel/runtime/helpers/esm/)']
 };
-
-module.exports = {
-  ...config,
-  projects: [
-    {
-      ...defaultConfig,
-      displayName: 'all-tests',
-      globalSetup: './jest/globalSetup.ts',
-      globalTeardown: './jest/globalTeardown.ts'
-    },
-    {
-      ...defaultConfig,
-      displayName: 'fast-tests'
-    }
-  ],
-  testTimeout: 25000
-};
diff --git a/package.json b/package.json
index 95638e425755..e105604ea410 100644
--- a/package.json
+++ b/package.json
@@ -58,9 +58,9 @@
     "lint:css": "stylelint './packages/**/src/**/*.tsx'",
     "postinstall": "polkadot-dev-yarn-only",
     "postinstall:electron": "electron-builder install-app-deps",
-    "test": "echo 'tests skipped'",
-    "test:REPLACE": "polkadot-dev-run-test --selectProjects=fast-tests --silent --testPathIgnorePatterns slow --testNamePattern='^((?!--SLOW--).)*$'",
-    "test:all": "polkadot-dev-run-test --selectProjects=all-tests --silent",
+    "test:skipped": "echo 'tests skipped'",
+    "test": "polkadot-dev-run-test --runInBand --testPathIgnorePatterns slow --testNamePattern='^((?!--SLOW--).)*$'",
+    "test:all": "polkadot-dev-run-test --runInBand --config ./jest-slow.config.cjs",
     "test:one": "polkadot-dev-run-test",
     "start": "yarn clean && cd packages/apps && yarn webpack-cli serve --config webpack.serve.cjs --port 3000",
     "start:electron": "yarn clean:electronBuild && concurrently 'yarn build:devElectronMain && cd packages/apps-electron && electron ./build/electron.js' 'yarn build:devElectronRenderer'"