diff --git a/tgui/packages/common/perf.js b/tgui/packages/common/perf.js
new file mode 100644
index 0000000000..319b77cea3
--- /dev/null
+++ b/tgui/packages/common/perf.js
@@ -0,0 +1,44 @@
+/**
+ * Ghetto performance measurement tools.
+ *
+ * Uses NODE_ENV to redact itself from production bundles.
+ *
+ * @file
+ * @copyright 2020 Aleksej Komarov
+ * @license MIT
+ */
+
+let markersByLabel = {};
+
+/**
+ * Marks a certain spot in the code for later measurements.
+ */
+const mark = (label, timestamp) => {
+  if (process.env.NODE_ENV !== 'production') {
+    markersByLabel[label] = timestamp || Date.now();
+  }
+};
+
+/**
+ * Calculates and returns the difference between two markers as a string.
+ *
+ * Use logger.log() to print the measurement.
+ */
+const measure = (markerA, markerB) => {
+  if (process.env.NODE_ENV !== 'production') {
+    return timeDiff(
+      markersByLabel[markerA],
+      markersByLabel[markerB]);
+  }
+};
+
+const timeDiff = (startedAt, finishedAt) => {
+  const diff = Math.abs(finishedAt - startedAt);
+  const diffFrames = (diff / 16.6667).toFixed(2);
+  return `${diff}ms (${diffFrames} frames)`;
+};
+
+export const perf = {
+  mark,
+  measure,
+};
diff --git a/tgui/packages/common/redux.js b/tgui/packages/common/redux.js
index 7fb4432408..dc486ff7b8 100644
--- a/tgui/packages/common/redux.js
+++ b/tgui/packages/common/redux.js
@@ -69,3 +69,31 @@ export const applyMiddleware = (...middlewares) => {
     };
   };
 };
+
+/**
+ * Combines reducers by running them in their own object namespaces as
+ * defined in reducersObj paramter.
+ *
+ * Main difference from redux/combineReducers is that it preserves keys
+ * in the state that are not present in the reducers object. This function
+ * is also more flexible than the redux counterpart.
+ */
+export const combineReducers = reducersObj => {
+  const keys = Object.keys(reducersObj);
+  let hasChanged = false;
+  return (prevState, action) => {
+    const nextState = { ...prevState };
+    for (let key of keys) {
+      const reducer = reducersObj[key];
+      const prevDomainState = prevState[key];
+      const nextDomainState = reducer(prevDomainState, action);
+      if (prevDomainState !== nextDomainState) {
+        hasChanged = true;
+        nextState[key] = nextDomainState;
+      }
+    }
+    return hasChanged
+      ? nextState
+      : prevState;
+  };
+};
diff --git a/tgui/packages/common/storage.js b/tgui/packages/common/storage.js
new file mode 100644
index 0000000000..8e1d2183e4
--- /dev/null
+++ b/tgui/packages/common/storage.js
@@ -0,0 +1,76 @@
+/**
+ * Browser-agnostic abstraction of key-value web storage.
+ *
+ * @file
+ * @copyright 2020 Aleksej Komarov
+ * @license MIT
+ */
+
+export const STORAGE_NONE = 0;
+export const STORAGE_LOCAL_STORAGE = 1;
+export const STORAGE_INDEXED_DB = 2;
+
+const createMock = () => {
+  let storage = {};
+  const get = key => storage[key];
+  const set = (key, value) => {
+    storage[key] = value;
+  };
+  const remove = key => {
+    storage[key] = undefined;
+  };
+  const clear = () => {
+    // NOTE: On IE8, this will probably leak memory if used often.
+    storage = {};
+  };
+  return {
+    get,
+    set,
+    remove,
+    clear,
+    engine: STORAGE_NONE,
+  };
+};
+
+const createLocalStorage = () => {
+  const get = key => {
+    const value = localStorage.getItem(key);
+    if (typeof value !== 'string') {
+      return;
+    }
+    return JSON.parse(value);
+  };
+  const set = (key, value) => {
+    localStorage.setItem(key, JSON.stringify(value));
+  };
+  const remove = key => {
+    localStorage.removeItem(key);
+  };
+  const clear = () => {
+    localStorage.clear();
+  };
+  return {
+    get,
+    set,
+    remove,
+    clear,
+    engine: STORAGE_LOCAL_STORAGE,
+  };
+};
+
+const testLocalStorage = () => {
+  // Localstorage can sometimes throw an error, even if DOM storage is not
+  // disabled in IE11 settings.
+  // See: https://superuser.com/questions/1080011
+  try {
+    return Boolean(window.localStorage && window.localStorage.getItem);
+  }
+  catch {
+    return false;
+  }
+};
+
+export const storage = (
+  testLocalStorage() && createLocalStorage()
+  || createMock()
+);
diff --git a/tgui/packages/common/vector.js b/tgui/packages/common/vector.js
index 1562df5991..c3ac350a4e 100644
--- a/tgui/packages/common/vector.js
+++ b/tgui/packages/common/vector.js
@@ -1,4 +1,8 @@
 /**
+ * N-dimensional vector manipulation functions.
+ *
+ * Vectors are plain number arrays, i.e. [x, y, z].
+ *
  * @file
  * @copyright 2020 Aleksej Komarov
  * @license MIT
@@ -6,16 +10,6 @@
 
 import { map, reduce, zipWith } from './collections';
 
-/**
- * Creates a vector, with as many dimensions are there are arguments.
- */
-export const vecCreate = (...components) => {
-  if (Array.isArray(components[0])) {
-    return [...components[0]];
-  }
-  return components;
-};
-
 const ADD = (a, b) => a + b;
 const SUB = (a, b) => a - b;
 const MUL = (a, b) => a * b;
diff --git a/tgui/packages/tgui-dev-server/link/client.js b/tgui/packages/tgui-dev-server/link/client.js
index af7a920c64..4671b340c5 100644
--- a/tgui/packages/tgui-dev-server/link/client.js
+++ b/tgui/packages/tgui-dev-server/link/client.js
@@ -98,8 +98,8 @@ const sendRawMessage = msg => {
         socket.send(json);
       }
       else {
-        // Keep only 10 latest messages in the queue
-        if (queue.length > 10) {
+        // Keep only 100 latest messages in the queue
+        if (queue.length > 100) {
           queue.shift();
         }
         queue.push(json);