diff --git a/app/astride/sandbox.js b/app/astride/sandbox.js
index 7ab8b9d..59731eb 100644
--- a/app/astride/sandbox.js
+++ b/app/astride/sandbox.js
@@ -248,6 +248,11 @@ export default class Sandbox {
     }
   }
 
+  reset() {
+    this.generator = undefined;
+    this.compile();
+  }
+
   run(ops = 1000) {
     let result;
     for (let i = 0; i < ops; ++i) {
@@ -265,8 +270,7 @@ export default class Sandbox {
     }
     const result = this.generator.next();
     if (result.done) {
-      this.generator = undefined;
-      this.compile();
+      this.reset();
     }
     return result;
   }
diff --git a/app/context/assets.js b/app/context/assets.js
new file mode 100644
index 0000000..a493e95
--- /dev/null
+++ b/app/context/assets.js
@@ -0,0 +1,25 @@
+import {Assets} from '@pixi/assets';
+import {createContext, useContext, useEffect} from 'react';
+
+const context = createContext();
+
+export default context;
+
+const loading = {};
+
+export function useAsset(source) {
+  const [assets, setAssets] = useContext(context);
+  useEffect(() => {
+    if (!assets[source]) {
+      if (!loading[source]) {
+        (loading[source] = Assets.load(source)).then((asset) => {
+          setAssets((assets) => ({
+            ...assets,
+            [source]: asset,
+          }));
+        });
+      }
+    }
+  }, [assets, setAssets, source]);
+  return assets[source];
+}
diff --git a/app/ecs-components/inventory.js b/app/ecs-components/inventory.js
index 3f70728..198c294 100644
--- a/app/ecs-components/inventory.js
+++ b/app/ecs-components/inventory.js
@@ -43,57 +43,60 @@ export default class Inventory extends Component {
   instanceFromSchema() {
     const Instance = super.instanceFromSchema();
     const Component = this;
-    Instance.prototype.item = async function (slot) {
-      const {slots} = this;
-      if (!(slot in slots)) {
-        return undefined;
+    return class InventoryInstance extends Instance {
+      async item(slot) {
+        const {slots} = this;
+        if (!(slot in slots)) {
+          return undefined;
+        }
+        const {readAsset} = Component.ecs;
+        const chars = await readAsset([slots[slot].source, 'item.json'].join('/'))
+        const json = chars.byteLength > 0
+          ? JSON.parse(
+            (new TextDecoder()).decode(chars),
+          )
+          : {};
+        const item = {
+          ...slots[slot],
+          ...json,
+        };
+        const instance = this;
+        const proxy = new Proxy(item, {
+          set(target, property, value) {
+            slots[slot][property] = value;
+            if ('qty' === property && value <= 0) {
+              Component.markChange(instance.entity, 'slotChange', {[slot]: false});
+              delete slots[slot];
+            }
+            else {
+              Component.markChange(instance.entity, 'slotChange', {[slot]: {[property]: value}});
+            }
+            return true;
+          },
+        });
+        return proxy;
       }
-      const {readAsset} = Component.ecs;
-      const json = await (
-        readAsset([slots[slot].source, 'item.json'].join('/'))
-          .then((response) => (response.ok ? response.json() : {}))
-      );
-      const item = {
-        ...slots[slot],
-        ...json,
-      };
-      const instance = this;
-      const proxy = new Proxy(item, {
-        set(target, property, value) {
-          slots[slot][property] = value;
-          if ('qty' === property && value <= 0) {
-            Component.markChange(instance.entity, 'slotChange', {[slot]: false});
-            delete slots[slot];
-          }
-          else {
-            Component.markChange(instance.entity, 'slotChange', {[slot]: {[property]: value}});
-          }
-          return true;
-        },
-      });
-      return proxy;
-    };
-    Instance.prototype.swapSlots = function(l, r) {
-      const {slots} = this;
-      const tmp = slots[l];
-      const change = {};
-      if (slots[r]) {
-        change[l] = slots[l] = slots[r];
+      swapSlots(l, r) {
+        const {slots} = this;
+        const tmp = slots[l];
+        const change = {};
+        if (slots[r]) {
+          change[l] = slots[l] = slots[r];
+        }
+        else {
+          change[l] = false;
+          delete slots[l];
+        }
+        if (tmp) {
+          change[r] = slots[r] = tmp;
+        }
+        else {
+          change[r] = false;
+          delete slots[r];
+        }
+        Component.markChange(this.entity, 'slotChange', change);
       }
-      else {
-        change[l] = false;
-        delete slots[l];
-      }
-      if (tmp) {
-        change[r] = slots[r] = tmp;
-      }
-      else {
-        change[r] = false;
-        delete slots[r];
-      }
-      Component.markChange(this.entity, 'slotChange', change);
-    };
-    return Instance;
+    }
   }
   static properties = {
     slots: {
diff --git a/app/ecs-components/ticking.js b/app/ecs-components/ticking.js
index 4cd9320..d9a6725 100644
--- a/app/ecs-components/ticking.js
+++ b/app/ecs-components/ticking.js
@@ -4,34 +4,32 @@ export default class Ticking extends Component {
   instanceFromSchema() {
     const Instance = super.instanceFromSchema();
 
-    Instance.prototype.$$finished = [];
-    Instance.prototype.$$tickingPromises = [];
-    Instance.prototype.addTickingPromise = function(tickingPromise) {
-      this.$$tickingPromises.push(tickingPromise);
-      tickingPromise.then(() => {
-        this.$$finished.push(tickingPromise);
-      });
+    return class TickingInstance extends Instance {
+
+      $$finished = [];
+      $$tickingPromises = [];
+
+      addTickingPromise(tickingPromise) {
+        this.$$tickingPromises.push(tickingPromise);
+        tickingPromise.then(() => {
+          this.$$finished.push(tickingPromise);
+        });
+      }
+
+      tick(elapsed) {
+        for (const tickingPromise of this.$$finished) {
+          this.$$tickingPromises.splice(
+            this.$$tickingPromises.indexOf(tickingPromise),
+            1,
+          );
+        }
+        this.$$finished = [];
+        for (const tickingPromise of this.$$tickingPromises) {
+          tickingPromise.tick(elapsed);
+        }
+      }
+
     }
-    Instance.prototype.tick = function(elapsed) {
-      for (const tickingPromise of this.$$finished) {
-        this.$$tickingPromises.splice(
-          this.$$tickingPromises.indexOf(tickingPromise),
-          1,
-        );
-      }
-      this.$$finished = [];
-      for (const tickingPromise of this.$$tickingPromises) {
-        tickingPromise.tick(elapsed);
-      }
-      for (const tickingPromise of this.$$finished) {
-        this.$$tickingPromises.splice(
-          this.$$tickingPromises.indexOf(tickingPromise),
-          1,
-        );
-      }
-      this.$$finished = [];
-    }
-    return Instance;
   }
   static properties = {
     isTicking: {defaultValue: 1, type: 'uint8'},
diff --git a/app/ecs-components/tile-layers.js b/app/ecs-components/tile-layers.js
index c262de5..fb57a2d 100644
--- a/app/ecs-components/tile-layers.js
+++ b/app/ecs-components/tile-layers.js
@@ -37,53 +37,54 @@ export default class TileLayers extends Component {
   instanceFromSchema() {
     const Instance = super.instanceFromSchema();
     const Component = this;
-    Instance.prototype.layer = function (index) {
-      const {layers} = this;
-      if (!(index in layers)) {
-        return undefined;
-      }
-      const instance = this;
-      class LayerProxy {
-        constructor(layer) {
-          this.layer = layer;
+    return class TileLayersInstance extends Instance {
+      layer(index) {
+        const {layers} = this;
+        if (!(index in layers)) {
+          return undefined;
         }
-        get area() {
-          return this.layer.area;
-        }
-        get source() {
-          return this.layer.source;
-        }
-        stamp(at, data) {
-          const changes = {};
-          for (const row in data) {
-            const columns = data[row];
-            for (const column in columns) {
-              const tile = columns[column];
-              const x = at.x + parseInt(column);
-              const y = at.y + parseInt(row);
-              if (x < 0 || y < 0 || x >= this.layer.area.x || y >= this.layer.area.y) {
-                continue;
+        const instance = this;
+        class LayerProxy {
+          constructor(layer) {
+            this.layer = layer;
+          }
+          get area() {
+            return this.layer.area;
+          }
+          get source() {
+            return this.layer.source;
+          }
+          stamp(at, data) {
+            const changes = {};
+            for (const row in data) {
+              const columns = data[row];
+              for (const column in columns) {
+                const tile = columns[column];
+                const x = at.x + parseInt(column);
+                const y = at.y + parseInt(row);
+                if (x < 0 || y < 0 || x >= this.layer.area.x || y >= this.layer.area.y) {
+                  continue;
+                }
+                const calculated = y * this.layer.area.x + x;
+                this.layer.data[calculated] = tile;
+                changes[calculated] = tile;
               }
-              const calculated = y * this.layer.area.x + x;
-              this.layer.data[calculated] = tile;
-              changes[calculated] = tile;
             }
+            Component.markChange(instance.entity, 'layerChange', {[index]: changes});
           }
-          Component.markChange(instance.entity, 'layerChange', {[index]: changes});
-        }
-        tile({x, y}) {
-          if (x < 0 || y < 0 || x >= this.layer.area.x || y >= this.layer.area.y) {
-            return undefined;
+          tile({x, y}) {
+            if (x < 0 || y < 0 || x >= this.layer.area.x || y >= this.layer.area.y) {
+              return undefined;
+            }
+            return this.layer.data[y * this.layer.area.x + x];
+          }
+          get tileSize() {
+            return this.layer.tileSize;
           }
-          return this.layer.data[y * this.layer.area.x + x];
-        }
-        get tileSize() {
-          return this.layer.tileSize;
         }
+        return new LayerProxy(layers[index]);
       }
-      return new LayerProxy(layers[index]);
-    };
-    return Instance;
+    }
   }
   static properties = {
     layers: {
diff --git a/app/ecs-components/wielder.js b/app/ecs-components/wielder.js
index 57c2ca4..73383fd 100644
--- a/app/ecs-components/wielder.js
+++ b/app/ecs-components/wielder.js
@@ -71,15 +71,14 @@ export default class Wielder extends Component {
         const activeItem = await this.activeItem();
         if (activeItem) {
           ecs.readAsset([activeItem.source, state ? 'start.js' : 'stop.js'].join('/'))
-            .then((script) => (script.ok ? script.text() : ''))
             .then((code) => {
-              if (code) {
+              if (code.byteLength > 0) {
                 const context = {
                   ecs,
                   item: activeItem,
                   wielder: entity,
                 };
-                Ticking.addTickingPromise(Script.tickingPromise(code, context));
+                Ticking.addTickingPromise(Script.tickingPromise((new TextDecoder()).decode(code), context));
               }
             });
         }
diff --git a/app/hooks/use-asset.js b/app/hooks/use-asset.js
deleted file mode 100644
index 32dea61..0000000
--- a/app/hooks/use-asset.js
+++ /dev/null
@@ -1,15 +0,0 @@
-import {Assets} from '@pixi/assets';
-import {useEffect, useState} from 'react';
-
-export default function useAsset(source) {
-  const [asset, setAsset] = useState();
-  useEffect(() => {
-    if (Assets.cache.has(source)) {
-      setAsset(Assets.get(source));
-    }
-    else {
-      Assets.load(source).then(setAsset);
-    }
-  }, [setAsset, source]);
-  return asset;
-}
diff --git a/app/net/server/worker.js b/app/net/server/worker.js
index ca2aafb..b548e3d 100644
--- a/app/net/server/worker.js
+++ b/app/net/server/worker.js
@@ -14,7 +14,9 @@ class WorkerServer extends Server {
     return ['UNIVERSE', path].join('/');
   }
   async readAsset(path) {
-    return fetch(path);
+    return fetch(path).then((response) => (
+      response.ok ? response.arrayBuffer() : new ArrayBuffer(0)
+    ));
   }
   async readData(path) {
     const data = await get(this.constructor.qualify(path));
diff --git a/app/react-components/pixi.jsx b/app/react-components/pixi.jsx
index 09ce749..13bb4ac 100644
--- a/app/react-components/pixi.jsx
+++ b/app/react-components/pixi.jsx
@@ -6,6 +6,7 @@ import {BaseTexture} from '@pixi/core';
 import {createElement, useContext} from 'react';
 
 import {RESOLUTION} from '@/constants.js';
+import AssetsContext from '@/context/assets.js';
 import ClientContext from '@/context/client.js';
 import DebugContext from '@/context/debug.js';
 import EcsContext from '@/context/ecs.js';
@@ -16,7 +17,7 @@ import styles from './pixi.module.css';
 
 BaseTexture.defaultOptions.scaleMode = SCALE_MODES.NEAREST;
 
-const Contexts = [ClientContext, DebugContext, EcsContext, MainEntityContext];
+const Contexts = [AssetsContext, ClientContext, DebugContext, EcsContext, MainEntityContext];
 
 const ContextBridge = ({children, render}) => {
   const contexts = Contexts.map(useContext);
diff --git a/app/react-components/sprite.jsx b/app/react-components/sprite.jsx
index c57c5fb..b9619d3 100644
--- a/app/react-components/sprite.jsx
+++ b/app/react-components/sprite.jsx
@@ -1,6 +1,6 @@
 import {Sprite as PixiSprite} from '@pixi/react';
 
-import useAsset from '@/hooks/use-asset.js';
+import {useAsset} from '@/context/assets.js';
 
 export default function Sprite({entity}) {
   const asset = useAsset(entity.Sprite.source);
diff --git a/app/react-components/tile-layer.jsx b/app/react-components/tile-layer.jsx
index 87db0c7..4305589 100644
--- a/app/react-components/tile-layer.jsx
+++ b/app/react-components/tile-layer.jsx
@@ -2,7 +2,7 @@ import {PixiComponent} from '@pixi/react';
 import '@pixi/spritesheet'; // NECESSARY!
 import {CompositeTilemap} from '@pixi/tilemap';
 
-import useAsset from '@/hooks/use-asset.js';
+import {useAsset} from '@/context/assets.js';
 
 const TileLayerInternal = PixiComponent('TileLayer', {
   create: () => new CompositeTilemap(),
diff --git a/app/routes/_main-menu.play.$.$/route.jsx b/app/routes/_main-menu.play.$.$/route.jsx
index 1f1c326..eeaa10f 100644
--- a/app/routes/_main-menu.play.$.$/route.jsx
+++ b/app/routes/_main-menu.play.$.$/route.jsx
@@ -2,6 +2,7 @@ import {json} from "@remix-run/node";
 import {useEffect, useState} from 'react';
 import {useOutletContext, useParams} from 'react-router-dom';
 
+import AssetsContext from '@/context/assets.js';
 import ClientContext from '@/context/client.js';
 import DebugContext from '@/context/debug.js';
 import EcsContext from '@/context/ecs.js';
@@ -12,9 +13,28 @@ import Systems from '@/ecs-systems/index.js';
 import Ui from '@/react-components/ui.jsx';
 import {juggleSession} from '@/session.server';
 
+import {LRUCache} from 'lru-cache';
+
+export const cache = new LRUCache({
+  max: 128,
+});
+
 class ClientEcs extends Ecs {
   readAsset(uri) {
-    return fetch(new URL(uri, window.location.origin));
+    if (!cache.has(uri)) {
+      let promise, resolve, reject;
+      promise = new Promise((res, rej) => {
+        resolve = res;
+        reject = rej;
+      });
+      cache.set(uri, promise);
+      fetch(new URL(uri, window.location.origin))
+        .then(async (response) => {
+          resolve(response.ok ? response.arrayBuffer() : new ArrayBuffer(0));
+        })
+        .catch(reject);
+    }
+    return cache.get(uri);
   }
 }
 
@@ -25,6 +45,7 @@ export async function loader({request}) {
 
 export default function PlaySpecific() {
   const Client = useOutletContext();
+  const assetsTuple = useState({});
   const [client, setClient] = useState();
   const mainEntityTuple = useState();
   const debugTuple = useState(false);
@@ -102,7 +123,9 @@ export default function PlaySpecific() {
       <MainEntityContext.Provider value={mainEntityTuple}>
         <EcsContext.Provider value={ecsTuple}>
           <DebugContext.Provider value={debugTuple}>
-            <Ui disconnected={disconnected} />
+            <AssetsContext.Provider value={assetsTuple}>
+              <Ui disconnected={disconnected} />
+            </AssetsContext.Provider>
           </DebugContext.Provider>
         </EcsContext.Provider>
       </MainEntityContext.Provider>
diff --git a/app/util/script.js b/app/util/script.js
index 28e82a9..802b160 100644
--- a/app/util/script.js
+++ b/app/util/script.js
@@ -69,16 +69,18 @@ export default class Script {
   //   }
   // }
 
+  evaluateSync() {
+    this.sandbox.reset();
+    const {value: {value}} = this.sandbox.step();
+    return value;
+  }
+
   static async fromCode(code, context = {}) {
-    let ast;
-    if (cache.has(code)) {
-      ast = cache.get(code);
-    }
-    else {
-      cache.set(code, ast = await this.parse(code));
+    if (!cache.has(code)) {
+      cache.set(code, this.parse(code));
     }
     return new this(
-      new Sandbox(ast, this.createContext(context)),
+      new Sandbox(await cache.get(code), this.createContext(context)),
     );
   }
 
diff --git a/app/websocket.js b/app/websocket.js
index 6ae2d8c..8498848 100644
--- a/app/websocket.js
+++ b/app/websocket.js
@@ -53,7 +53,9 @@ class SocketServer extends Server {
     if ('production' === process.env.NODE_ENV) {
       url.protocol = 'http:';
     }
-    return fetch(url.href);
+    return fetch(url.href).then((response) => (
+      response.ok ? response.arrayBuffer() : new ArrayBuffer(0)
+    ));
   }
   async readData(path) {
     const qualified = this.constructor.qualify(path);