diff --git a/README.MD b/README.MD
index be25d24a..ca70dfc1 100644
--- a/README.MD
+++ b/README.MD
@@ -54,9 +54,9 @@ However, there are many things that can be done in online version. You can acces
 
 - `bot` - Mineflayer bot instance. See Mineflayer documentation for more.
 - `viewer` - Three.js viewer instance, basically does all the rendering.
-- `viewer.world.sectionMeshs` - Object with all active chunk sections (geometries) in the world. Each chunk section is a Three.js mesh or group.
-- `localServer` - Only for singleplayer host / guest mode. Flying Squid server instance, see it's documentation for more.
-- `localServer.overworld.storageProvider.regions` - See ALL LOADED region files with all raw data!
+- `viewer.world.sectionObjects` - Object with all active chunk sections (geometries) in the world. Each chunk section is a Three.js mesh or group.
+- `localServer` - Only for singleplayer mode/host. Flying Squid server instance, see it's documentation for more.
+- `localServer.overworld.storageProvider.regions` - See ALL LOADED region files with all raw data.
 
 - `nbt.simplify(someNbt)` - Simplifies nbt data, so it's easier to read.
 
diff --git a/prismarine-viewer/package.json b/prismarine-viewer/package.json
index ad3e601b..1d6d3b1c 100644
--- a/prismarine-viewer/package.json
+++ b/prismarine-viewer/package.json
@@ -42,6 +42,7 @@
     "socket.io": "^4.0.0",
     "socket.io-client": "^4.0.0",
     "three.meshline": "^1.3.0",
-    "vec3": "^0.1.7"
+    "vec3": "^0.1.7",
+    "node-canvas-webgl": "^0.3.0"
   }
 }
diff --git a/prismarine-viewer/viewer/lib/worldrenderer.js b/prismarine-viewer/viewer/lib/worldrenderer.js
index eeab4756..e64ab7e7 100644
--- a/prismarine-viewer/viewer/lib/worldrenderer.js
+++ b/prismarine-viewer/viewer/lib/worldrenderer.js
@@ -18,7 +18,8 @@ function mod (x, n) {
 class WorldRenderer {
   constructor (scene, numWorkers = 4) {
     this.blockEntities = {}
-    this.sectionMeshs = {}
+    this.sectionObjects = {}
+    this.showChunkBorders = false
     this.active = false
     this.version = undefined
     /** @type {THREE.Scene} */
@@ -47,11 +48,11 @@ class WorldRenderer {
         })
         if (data.type === 'geometry') {
           /** @type {THREE.Object3D} */
-          let mesh = this.sectionMeshs[data.key]
-          if (mesh) {
-            this.scene.remove(mesh)
-            dispose3(mesh)
-            delete this.sectionMeshs[data.key]
+          let object = this.sectionObjects[data.key]
+          if (object) {
+            this.scene.remove(object)
+            dispose3(object)
+            delete this.sectionObjects[data.key]
           }
 
           const chunkCoords = data.key.split(',')
@@ -64,25 +65,25 @@ class WorldRenderer {
           geometry.setAttribute('uv', new THREE.BufferAttribute(data.geometry.uvs, 2))
           geometry.setIndex(data.geometry.indices)
 
-          const _mesh = new THREE.Mesh(geometry, this.material)
-          _mesh.position.set(data.geometry.sx, data.geometry.sy, data.geometry.sz)
-          const boxHelper = new THREE.BoxHelper(_mesh, 0xffff00)
-          // shouldnt it compute once
+          const mesh = new THREE.Mesh(geometry, this.material)
+          mesh.position.set(data.geometry.sx, data.geometry.sy, data.geometry.sz)
+          object = new THREE.Group()
+          object.add(mesh)
+          if (this.showChunkBorders) {
+            const boxHelper = new THREE.BoxHelper(mesh, 0xffff00)
+            object.add(boxHelper)
+          }
+          // should not it compute once
           if (Object.keys(data.geometry.signs).length) {
-            mesh = new THREE.Group()
-            mesh.add(_mesh)
-            mesh.add(boxHelper)
             for (const [posKey, { isWall, rotation }] of Object.entries(data.geometry.signs)) {
               const [x, y, z] = posKey.split(',')
               const signBlockEntity = this.blockEntities[posKey]
               if (!signBlockEntity) continue
-              mesh.add(this.renderSign(new Vec3(+x, +y, +z), rotation, isWall, nbt.simplify(signBlockEntity)))
+              object.add(this.renderSign(new Vec3(+x, +y, +z), rotation, isWall, nbt.simplify(signBlockEntity)))
             }
-          } else {
-            mesh = _mesh
           }
-          this.sectionMeshs[data.key] = mesh
-          this.scene.add(mesh)
+          this.sectionObjects[data.key] = object
+          this.scene.add(object)
         } else if (data.type === 'sectionFinished') {
           this.sectionsOutstanding.delete(data.key)
           this.renderUpdateEmitter.emit('update')
@@ -125,10 +126,10 @@ class WorldRenderer {
 
   resetWorld () {
     this.active = false
-    for (const mesh of Object.values(this.sectionMeshs)) {
+    for (const mesh of Object.values(this.sectionObjects)) {
       this.scene.remove(mesh)
     }
-    this.sectionMeshs = {}
+    this.sectionObjects = {}
     this.loadedChunks = {}
     this.sectionsOutstanding = new Set()
     for (const worker of this.workers) {
@@ -196,12 +197,12 @@ class WorldRenderer {
     for (let y = 0; y < 256; y += 16) {
       this.setSectionDirty(new Vec3(x, y, z), false)
       const key = `${x},${y},${z}`
-      const mesh = this.sectionMeshs[key]
+      const mesh = this.sectionObjects[key]
       if (mesh) {
         this.scene.remove(mesh)
         dispose3(mesh)
       }
-      delete this.sectionMeshs[key]
+      delete this.sectionObjects[key]
     }
   }
 
diff --git a/src/controls.ts b/src/controls.ts
index def14644..e0d8ad28 100644
--- a/src/controls.ts
+++ b/src/controls.ts
@@ -8,6 +8,7 @@ import { CommandEventArgument, SchemaCommandInput } from 'contro-max/build/types
 import { stringStartsWith } from 'contro-max/build/stringUtils'
 import { isGameActive, showModal, gameAdditionalState, activeModalStack, hideCurrentModal } from './globalState'
 import { reloadChunks } from './utils'
+import { options } from './optionsStorage'
 
 // doesnt seem to work for now
 const customKeymaps = proxy(JSON.parse(localStorage.keymap || '{}'))
@@ -48,12 +49,12 @@ export const contro = new ControMax({
   },
 }, {
   target: document,
-  captureEvents() {
+  captureEvents () {
     return bot && isGameActive(false)
   },
   storeProvider: {
     load: () => customKeymaps,
-    save() { },
+    save () { },
   },
   gamepadPollingInterval: 10
 })
@@ -103,10 +104,10 @@ let lastCommandTrigger = null as { command: string, time: number } | null
 
 const secondActionActivationTimeout = 300
 const secondActionCommands = {
-  'general.jump'() {
+  'general.jump' () {
     toggleFly()
   },
-  'general.forward'() {
+  'general.forward' () {
     setSprinting(true)
   }
 }
@@ -233,14 +234,23 @@ document.addEventListener('keydown', (e) => {
       }
       reloadChunks()
     }
+    if (e.code === 'KeyG') {
+      // todo make it work without reload
+      options.showChunkBorders = !options.showChunkBorders
+    }
+    return
   }
 
-  if (hardcodedPressedKeys.has(e.code)) return
   hardcodedPressedKeys.add(e.code)
 })
 document.addEventListener('keyup', (e) => {
   hardcodedPressedKeys.delete(e.code)
 })
+document.addEventListener('visibilitychange', (e) => {
+  if (document.visibilityState === 'hidden') {
+    hardcodedPressedKeys.clear()
+  }
+})
 
 // #region creative fly
 // these controls are more like for gamemode 3
diff --git a/src/index.ts b/src/index.ts
index 15ebc6b4..dedeab59 100644
--- a/src/index.ts
+++ b/src/index.ts
@@ -33,7 +33,7 @@ import { contro } from './controls'
 import './dragndrop'
 import './browserfs'
 import './eruda'
-import './watchOptions'
+import { watchOptionsAfterViewerInit } from './watchOptions'
 import downloadAndOpenFile from './downloadAndOpenFile'
 
 import net from 'net'
@@ -111,6 +111,7 @@ window.viewer = viewer
 viewer.entities.entitiesOptions = {
   fontFamily: 'mojangles'
 }
+watchOptionsAfterViewerInit()
 initPanoramaOptions(viewer)
 watchTexturepackInViewer(viewer)
 
@@ -163,7 +164,7 @@ const updateCursor = () => {
   debugMenu ??= hud.shadowRoot.querySelector('#debug-overlay')
   debugMenu.cursorBlock = blockInteraction.cursorBlock
 }
-function onCameraMove(e) {
+function onCameraMove (e) {
   if (e.type !== 'touchmove' && !pointerLock.hasPointerLock) return
   e.stopPropagation?.()
   const now = performance.now()
@@ -181,12 +182,12 @@ function onCameraMove(e) {
 window.addEventListener('mousemove', onCameraMove, { capture: true })
 
 
-function hideCurrentScreens() {
+function hideCurrentScreens () {
   activeModalStacks['main-menu'] = [...activeModalStack]
   insertActiveModalStack('', [])
 }
 
-async function main() {
+async function main () {
   const menu = document.getElementById('play-screen')
   menu.addEventListener('connect', e => {
     const options = e.detail
@@ -234,7 +235,7 @@ const cleanConnectIp = (host: string | undefined, defaultPort: string | undefine
   }
 }
 
-async function connect(connectOptions: {
+async function connect (connectOptions: {
   server?: string; singleplayer?: any; username?: string; password?: any; proxy?: any; botVersion?: any; serverOverrides?; peerId?: string
 }) {
   document.getElementById('play-screen').style = 'display: none;'
@@ -377,7 +378,7 @@ async function connect(connectOptions: {
       } : {},
       ...singeplayer ? {
         version: serverOptions.version,
-        connect() { },
+        connect () { },
         Client: CustomChannelClient as any,
       } : {},
       username,
@@ -387,7 +388,7 @@ async function connect(connectOptions: {
       noPongTimeout: 240 * 1000,
       closeTimeout: 240 * 1000,
       respawn: options.autoRespawn,
-      async versionSelectedHook(client) {
+      async versionSelectedHook (client) {
         // todo keep in sync with esbuild preload, expose cache ideally
         if (client.version === '1.20.1') {
           // ignore cache hit
@@ -542,7 +543,7 @@ async function connect(connectOptions: {
     dayCycle()
 
     // Bot position callback
-    function botPosition() {
+    function botPosition () {
       // this might cause lag, but not sure
       viewer.setFirstPersonCamera(bot.entity.position, bot.entity.yaw, bot.entity.pitch)
       worldView.updatePosition(bot.entity.position)
@@ -560,7 +561,7 @@ async function connect(connectOptions: {
       bot.entity.yaw -= x
     }
 
-    function changeCallback() {
+    function changeCallback () {
       notification.show = false
       if (!pointerLock.hasPointerLock && activeModalStack.length === 0) {
         showModal(pauseMenu)
diff --git a/src/optionsStorage.ts b/src/optionsStorage.ts
index d6428a5e..427c5f3e 100644
--- a/src/optionsStorage.ts
+++ b/src/optionsStorage.ts
@@ -27,6 +27,7 @@ const defaultOptions = {
   touchButtonsSize: 40,
   highPerformanceGpu: false,
 
+  showChunkBorders: false,
   frameLimit: false as number | false,
   alwaysBackupWorldBeforeLoading: undefined as boolean | undefined | null,
   alwaysShowMobileControls: false,
@@ -61,7 +62,7 @@ type WatchValue = <T extends Record<string, any>>(proxy: T, callback: (p: T) =>
 export const watchValue: WatchValue = (proxy, callback) => {
   const watchedProps = new Set<string>()
   callback(new Proxy(proxy, {
-    get(target, p, receiver) {
+    get (target, p, receiver) {
       watchedProps.add(p.toString())
       return Reflect.get(target, p, receiver)
     },
diff --git a/src/watchOptions.ts b/src/watchOptions.ts
index de545033..026c43cb 100644
--- a/src/watchOptions.ts
+++ b/src/watchOptions.ts
@@ -1,7 +1,13 @@
 // not all options are watched here
 
 import { subscribeKey } from 'valtio/utils'
-import { options } from './optionsStorage'
+import { options, watchValue } from './optionsStorage'
 import { reloadChunks } from './utils'
 
 subscribeKey(options, 'renderDistance', reloadChunks)
+
+export const watchOptionsAfterViewerInit = () => {
+  watchValue(options, o => {
+    viewer.world.showChunkBorders = o.showChunkBorders
+  })
+}