diff --git a/prismarine-viewer/viewer/lib/mesher/models.ts b/prismarine-viewer/viewer/lib/mesher/models.ts
index 88505c06..8b9115e7 100644
--- a/prismarine-viewer/viewer/lib/mesher/models.ts
+++ b/prismarine-viewer/viewer/lib/mesher/models.ts
@@ -282,6 +282,7 @@ function renderElement (world: World, cursor: Vec3, element: BlockElement, doAO:
 
     const aos: number[] = []
     const neighborPos = position.plus(new Vec3(...dir))
+    // 10%
     const baseLight = world.getLight(neighborPos, undefined, undefined, block.name) / 15
     for (const pos of corners) {
       let vertex = [
@@ -290,7 +291,7 @@ function renderElement (world: World, cursor: Vec3, element: BlockElement, doAO:
         (pos[2] ? maxz : minz)
       ]
 
-      if (!needTiles) {
+      if (!needTiles) { // 10%
         vertex = vecadd3(matmul3(localMatrix, vertex), localShift)
         vertex = vecadd3(matmul3(globalMatrix, vertex), globalShift)
         vertex = vertex.map(v => v / 16)
@@ -411,7 +412,7 @@ export function getSectionGeometry (sx, sy, sz, world: World) {
     // todo this can be removed here
     signs: {},
     // isFull: true,
-    highestBlocks: {},
+    highestBlocks: {}, // todo migrate to map for 2% boost perf
     hadErrors: false
   }
 
@@ -449,7 +450,7 @@ export function getSectionGeometry (sx, sy, sz, world: World) {
         }
         const biome = block.biome.name
 
-        if (world.preflat) {
+        if (world.preflat) { // 10% perf
           const patchProperties = preflatBlockCalculation(block, world, cursor)
           if (patchProperties) {
             block._originalProperties ??= block._properties
@@ -505,6 +506,7 @@ export function getSectionGeometry (sx, sy, sz, world: World) {
             const model = modelVars[useVariant] ?? modelVars[0]
             if (!model) continue
 
+            // #region 10%
             let globalMatrix = null as any
             let globalShift = null as any
             for (const axis of ['x', 'y', 'z'] as const) {
@@ -518,6 +520,7 @@ export function getSectionGeometry (sx, sy, sz, world: World) {
               globalShift = [8, 8, 8]
               globalShift = vecsub3(globalShift, matmul3(globalMatrix, globalShift))
             }
+            // #endregion
 
             for (const element of model.elements ?? []) {
               const ao = model.ao ?? true
@@ -527,6 +530,7 @@ export function getSectionGeometry (sx, sy, sz, world: World) {
                   renderElement(world, pos, element, ao, attr, globalMatrix, globalShift, block, biome)
                 })
               } else {
+                // 60%
                 renderElement(world, cursor, element, ao, attr, globalMatrix, globalShift, block, biome)
               }
             }
diff --git a/src/react/AppStatus.tsx b/src/react/AppStatus.tsx
index ca83c29a..31f08641 100644
--- a/src/react/AppStatus.tsx
+++ b/src/react/AppStatus.tsx
@@ -2,8 +2,18 @@ import { useEffect, useState } from 'react'
 import styles from './appStatus.module.css'
 import Button from './Button'
 import Screen from './Screen'
+import LoadingChunks from './LoadingChunks'
 
-export default ({ status, isError, hideDots = false, lastStatus = '', backAction = undefined as undefined | (() => void), description = '', actionsSlot = null as React.ReactNode | null }) => {
+export default ({
+  status,
+  isError,
+  hideDots = false,
+  lastStatus = '',
+  backAction = undefined as undefined | (() => void),
+  description = '',
+  actionsSlot = null as React.ReactNode | null,
+  children
+}) => {
   const [loadingDots, setLoadingDots] = useState('')
 
   useEffect(() => {
@@ -52,6 +62,7 @@ export default ({ status, isError, hideDots = false, lastStatus = '', backAction
           <Button onClick={() => window.location.reload()} label="Reset App (recommended)" />
         </>
       )}
+      {children}
     </Screen>
   )
 }
diff --git a/src/react/AppStatusProvider.tsx b/src/react/AppStatusProvider.tsx
index 179905fc..d853c262 100644
--- a/src/react/AppStatusProvider.tsx
+++ b/src/react/AppStatusProvider.tsx
@@ -1,6 +1,6 @@
 import { proxy, useSnapshot } from 'valtio'
-import { useEffect, useState } from 'react'
-import { activeModalStack, activeModalStacks, hideModal, insertActiveModalStack, miscUiState } from '../globalState'
+import { useEffect, useRef, useState } from 'react'
+import { activeModalStack, activeModalStacks, hideModal, insertActiveModalStack, miscUiState, showModal } from '../globalState'
 import { resetLocalStorageWorld } from '../browserfs'
 import { fsState } from '../loadSave'
 import { guessProblem } from '../errorLoadingScreenHelpers'
@@ -14,6 +14,7 @@ import { useIsModalActive } from './utilsApp'
 import Button from './Button'
 import { AuthenticatedAccount, updateAuthenticatedAccountData, updateLoadedServerData } from './ServersListProvider'
 import { showOptionsModal } from './SelectOption'
+import LoadingChunks from './LoadingChunks'
 
 const initialState = {
   status: '',
@@ -22,9 +23,12 @@ const initialState = {
   descriptionHint: '',
   isError: false,
   hideDots: false,
+  loadingChunksData: null as null | Record<string, string>,
+  loadingChunksDataPlayerChunk: null as null | { x: number, z: number },
+  isDisplaying: false
 }
 export const appStatusState = proxy(initialState)
-const resetState = () => {
+export const resetAppStatusState = () => {
   Object.assign(appStatusState, initialState)
 }
 
@@ -33,7 +37,7 @@ export const lastConnectOptions = {
 }
 
 export default () => {
-  const { isError, lastStatus, maybeRecoverable, status, hideDots, descriptionHint } = useSnapshot(appStatusState)
+  const { isError, lastStatus, maybeRecoverable, status, hideDots, descriptionHint, loadingChunksData, loadingChunksDataPlayerChunk } = useSnapshot(appStatusState)
   const { active: replayActive } = useSnapshot(packetsReplaceSessionState)
 
   const isOpen = useIsModalActive('app-status')
@@ -52,7 +56,7 @@ export default () => {
   }, [isOpen])
 
   const reconnect = () => {
-    resetState()
+    resetAppStatusState()
     window.dispatchEvent(new window.CustomEvent('connect', {
       detail: lastConnectOptions.value
     }))
@@ -93,7 +97,7 @@ export default () => {
       lastStatus={lastStatus}
       description={displayAuthButton ? '' : (isError ? guessProblem(status) : '') || descriptionHint}
       backAction={maybeRecoverable ? () => {
-        resetState()
+        resetAppStatusState()
         miscUiState.gameLoaded = false
         miscUiState.loadedDataVersion = null
         window.loadedData = undefined
@@ -113,10 +117,25 @@ export default () => {
           {replayActive && <Button label='Download Packets Replay' onClick={downloadPacketsReplay} />}
         </>
       }
-    />
+    >
+      {loadingChunksData && <LoadingChunks regionFiles={Object.keys(loadingChunksData)} stateMap={loadingChunksData} playerChunk={loadingChunksDataPlayerChunk} />}
+      {isOpen && <DisplayingIndicator />}
+    </AppStatus>
   </DiveTransition>
 }
 
+const DisplayingIndicator = () => {
+  useEffect(() => {
+    requestAnimationFrame(() => {
+      requestAnimationFrame(() => {
+        appStatusState.isDisplaying = true
+      })
+    })
+  }, [])
+
+  return <div />
+}
+
 const PossiblyVpnBypassProxyButton = ({ reconnect }: { reconnect: () => void }) => {
   const [vpnBypassProxy, setVpnBypassProxy] = useState('')
 
diff --git a/src/react/DiveTransition.tsx b/src/react/DiveTransition.tsx
index cd78dd66..82837876 100644
--- a/src/react/DiveTransition.tsx
+++ b/src/react/DiveTransition.tsx
@@ -9,7 +9,7 @@ const endExitStyle = { opacity: 0, transform: 'translateZ(150px)' }
 const endStyle = { opacity: 1, transform: 'translateZ(0)' }
 
 const stateStyles = {
-  entering: startStyle,
+  entering: endStyle,
   entered: endStyle,
   exiting: endExitStyle,
   exited: endExitStyle,
@@ -26,6 +26,15 @@ export default ({ children, open }) => {
     if (!mounted && open) {
       setMounted(true)
     }
+    let timeout
+    if (mounted && !open) {
+      timeout = setTimeout(() => {
+        setMounted(false)
+      }, duration)
+    }
+    return () => {
+      if (timeout) clearTimeout(timeout)
+    }
   }, [open])
 
   if (!mounted) return null
@@ -43,5 +52,4 @@ export default ({ children, open }) => {
       </div>
     }}
   </Transition>
-
 }
diff --git a/src/react/LoadingChunks.css b/src/react/LoadingChunks.css
new file mode 100644
index 00000000..324cbb5f
--- /dev/null
+++ b/src/react/LoadingChunks.css
@@ -0,0 +1,12 @@
+@keyframes loading-chunks-loading-animation {
+    /* blink */
+    0% {
+        opacity: 0.5;
+    }
+    50% {
+        opacity: 1;
+    }
+    100% {
+        opacity: 0.5;
+    }
+}
diff --git a/src/react/LoadingChunks.stories.tsx b/src/react/LoadingChunks.stories.tsx
new file mode 100644
index 00000000..5b91cc0c
--- /dev/null
+++ b/src/react/LoadingChunks.stories.tsx
@@ -0,0 +1,43 @@
+import type { Meta, StoryObj } from '@storybook/react'
+
+import { useEffect, useState } from 'react'
+import LoadingChunks from './LoadingChunks'
+
+const meta: Meta<typeof LoadingChunks> = {
+  component: LoadingChunks,
+  render (args) {
+    const [stateMap, setStateMap] = useState(Object.fromEntries(args.regionFiles!.map(x => x.split('.').slice(1, 3).map(Number).map(y => y.toString()).join(',')).map(x => [x, 'loading'])))
+
+    useEffect(() => {
+      const interval = setInterval(() => {
+        // pick random and set to done
+        const random = Math.floor(Math.random() * args.regionFiles!.length)
+        const [x, z] = args.regionFiles![random].split('.').slice(1, 3).map(Number)
+        setStateMap(prev => ({ ...prev, [`${x},${z}`]: 'done' }))
+      }, 1000)
+      return () => clearInterval(interval)
+    }, [])
+
+    return <LoadingChunks stateMap={stateMap} {...args} />
+  },
+}
+
+export default meta
+type Story = StoryObj<typeof LoadingChunks>
+
+export const Primary: Story = {
+  args: {
+    regionFiles: [
+      'r.-1.-1.mca',
+      'r.-1.0.mca',
+      'r.0.-1.mca',
+      'r.0.0.mca',
+      'r.0.1.mca',
+    ],
+    playerChunk: {
+      x: -1,
+      z: 0
+    },
+    displayText: true,
+  },
+}
diff --git a/src/react/LoadingChunks.tsx b/src/react/LoadingChunks.tsx
new file mode 100644
index 00000000..03943eb2
--- /dev/null
+++ b/src/react/LoadingChunks.tsx
@@ -0,0 +1,60 @@
+import { useEffect, useRef } from 'react'
+import './LoadingChunks.css'
+
+export default ({ regionFiles = [] as string[], stateMap = {} as Record<string, string>, displayText = false, playerChunk = null as null | { x: number, z: number } }) => {
+  // visualize downloading chunks
+  const regionNumbers = regionFiles.map(x => x.split('.').slice(1, 3).map(Number))
+  const minX = Math.min(...regionNumbers.map(([x]) => x))
+  const maxX = Math.max(...regionNumbers.map(([x]) => x))
+  const minZ = Math.min(...regionNumbers.map(([, z]) => z))
+  const maxZ = Math.max(...regionNumbers.map(([, z]) => z))
+  const xChunks = maxX - minX + 1
+  const zChunks = maxZ - minZ + 1
+
+  return <div style={{
+    // maxWidth: '80%',
+    // maxHeight: '80%',
+    // aspectRatio: '1',
+    display: 'grid',
+    gridTemplateColumns: `repeat(${xChunks}, 1fr)`,
+    gridTemplateRows: `repeat(${zChunks}, 1fr)`,
+    gap: 1,
+    width: '110px',
+    height: '110px',
+  }}>
+    {Array.from({ length: xChunks * zChunks }).map((_, i) => {
+      const x = minX + i % xChunks
+      const z = minZ + Math.floor(i / xChunks)
+      const file = `r.${x}.${z}.mca`
+      const state = stateMap[file]
+      if (!regionFiles.includes(file)) return <div key={i} style={{ background: 'gray' }} />
+      return <Chunk key={i} x={x} z={z} state={state} displayText={displayText} currentPlayer={playerChunk?.x === x && playerChunk?.z === z} />
+    })}
+  </div>
+}
+
+const Chunk = ({ x, z, state, displayText, currentPlayer }) => {
+  const text = displayText ? `${x},${z}` : undefined
+
+  return <div style={{
+    display: 'flex',
+    justifyContent: 'center',
+    alignItems: 'center',
+    background: state === 'errored' ? 'red' : state === 'loading' ? 'white' : 'limegreen',
+    animation: state === 'loading' ? `loading-chunks-loading-animation 4s infinite cubic-bezier(0.4, 0, 0.2, 1)` : undefined,
+    transition: 'background 1s',
+    color: state === 'loading' ? 'black' : 'white',
+    position: 'relative',
+    zIndex: 1,
+  }}>
+    {/* green dot */}
+    {currentPlayer && <div style={{
+      position: 'absolute',
+      background: 'reed',
+      borderRadius: '50%',
+      width: '5px',
+      height: '5px',
+      zIndex: -1,
+    }} />}
+    {text}</div>
+}
diff --git a/src/react/PauseScreen.tsx b/src/react/PauseScreen.tsx
index 9f25810d..1c4fdcd4 100644
--- a/src/react/PauseScreen.tsx
+++ b/src/react/PauseScreen.tsx
@@ -1,9 +1,12 @@
 import { join } from 'path'
 import fs from 'fs'
 import { useEffect } from 'react'
-import { useSnapshot } from 'valtio'
+import { subscribe, useSnapshot } from 'valtio'
 import { usedServerPathsV1 } from 'flying-squid/dist/lib/modules/world'
 import { openURL } from 'prismarine-viewer/viewer/lib/simpleUtils'
+import { Vec3 } from 'vec3'
+import { generateSpiralMatrix } from 'flying-squid/dist/utils'
+import { subscribeKey } from 'valtio/utils'
 import {
   activeModalStack,
   showModal,
@@ -23,14 +26,29 @@ import Screen from './Screen'
 import styles from './PauseScreen.module.css'
 import { DiscordButton } from './DiscordButton'
 import { showNotification } from './NotificationProvider'
+import { appStatusState } from './AppStatusProvider'
+
+const waitForPotentialRender = async () => {
+  return new Promise<void>(resolve => {
+    requestAnimationFrame(() => requestAnimationFrame(resolve as any))
+  })
+}
 
 export const saveToBrowserMemory = async () => {
   setLoadingScreenStatus('Saving world')
   try {
+    await new Promise<void>(resolve => {
+      subscribeKey(appStatusState, 'isDisplaying', () => {
+        if (appStatusState.isDisplaying) {
+          resolve()
+        }
+      })
+    })
     //@ts-expect-error
     const { worldFolder } = localServer.options
     const saveRootPath = await uniqueFileNameFromWorldName(worldFolder.split('/').pop(), `/data/worlds`)
     await mkdirRecursive(saveRootPath)
+    console.log('made world folder', saveRootPath)
     const allRootPaths = [...usedServerPathsV1]
     const allFilesToCopy = [] as string[]
     for (const dirBase of allRootPaths) {
@@ -46,39 +64,87 @@ export const saveToBrowserMemory = async () => {
       }
       allFilesToCopy.push(...res.map(x => join(dirBase, x)))
     }
-    const pathsSplit = allFilesToCopy.reduce((acc, cur, i) => {
-      if (i % 15 === 0) {
-        acc.push([])
-      }
-      acc.at(-1)!.push(cur)
-      return acc
-    // eslint-disable-next-line @typescript-eslint/prefer-reduce-type-parameter
-    }, [] as string[][])
+    console.log('paths collected')
+    const pathsSplitBasic = allFilesToCopy.filter(path => {
+      if (!path.startsWith('region/')) return true
+      const [x, z] = path.split('/').at(-1)!.split('.').slice(1, 3).map(Number)
+      return Math.abs(x) > 50 || Math.abs(z) > 50 // HACK: otherwise it's too big and we can't handle it in visual display
+    })
     let copied = 0
-    const upProgress = () => {
+    let isRegionFiles = false
+    const upProgress = (totalSize: number) => {
       copied++
-      const action = fsState.remoteBackend ? 'Downloading & copying' : 'Copying'
-      setLoadingScreenStatus(`${action} files (${copied}/${allFilesToCopy.length})`)
+      let action = fsState.remoteBackend ? 'Downloading & copying' : 'Copying'
+      action += isRegionFiles ? ' region files (world chunks)' : ' basic save files'
+      setLoadingScreenStatus(`${action} files (${copied}/${totalSize})`)
     }
-    for (const copyPaths of pathsSplit) {
-      // eslint-disable-next-line no-await-in-loop
-      await Promise.all(copyPaths.map(async (copyPath) => {
-        const srcPath = join(worldFolder, copyPath)
-        const savePath = join(saveRootPath, copyPath)
-        await mkdirRecursive(savePath)
-        await fs.promises.writeFile(savePath, await fs.promises.readFile(srcPath))
-        upProgress()
-      }))
+    const copyFiles = async (copyPaths: string[][]) => {
+      const totalSIze = copyPaths.flat().length
+      for (const copyFileGroup of copyPaths) {
+        // eslint-disable-next-line no-await-in-loop, @typescript-eslint/no-loop-func
+        await Promise.all(copyFileGroup.map(async (copyPath) => {
+          const srcPath = join(worldFolder, copyPath)
+          const savePath = join(saveRootPath, copyPath)
+          await mkdirRecursive(savePath)
+          await fs.promises.writeFile(savePath, await fs.promises.readFile(srcPath))
+          upProgress(totalSIze)
+          if (isRegionFiles) {
+            const regionFile = copyPath.split('/').at(-1)!
+            appStatusState.loadingChunksData![regionFile] = 'done'
+          }
+        }))
+        // eslint-disable-next-line no-await-in-loop
+        await waitForPotentialRender()
+      }
     }
+    // basic save files
+    await copyFiles(splitByCopySize(pathsSplitBasic))
+    setLoadingScreenStatus('Preparing world chunks copying')
+    await waitForPotentialRender()
+
+    // region files
+    isRegionFiles = true
+    copied = 0
+    const regionFiles = allFilesToCopy.filter(x => !pathsSplitBasic.includes(x))
+    const regionFilesNumbers = regionFiles.map(x => x.split('/').at(-1)!.split('.').slice(1, 3).map(Number))
+    const xMin = Math.min(...regionFilesNumbers.flatMap(x => x[0]))
+    const zMin = Math.min(...regionFilesNumbers.flatMap(x => x[1]))
+    const xMax = Math.max(...regionFilesNumbers.flatMap(x => x[0]))
+    const zMax = Math.max(...regionFilesNumbers.flatMap(x => x[1]))
+    const playerPosRegion = bot.entity.position.divide(new Vec3(32 * 16, 32 * 16, 32 * 16)).floored()
+    const maxDistantRegion = Math.max(
+      Math.abs(playerPosRegion.x - xMin),
+      Math.abs(playerPosRegion.z - zMin),
+      Math.abs(playerPosRegion.x - xMax),
+      Math.abs(playerPosRegion.z - zMax)
+    )
+    const spiral = generateSpiralMatrix(maxDistantRegion)
+    const filesWithSpiral = spiral.filter(x => allFilesToCopy.includes(`region/r.${x[0]}.${x[1]}.mca`)).map(x => `region/r.${x[0]}.${x[1]}.mca`)
+    if (filesWithSpiral.length !== regionFiles.length) throw new Error('Something went wrong with region files')
+
+    appStatusState.loadingChunksData = Object.fromEntries(regionFiles.map(x => [x.split('/').at(-1)!, 'loading']))
+    appStatusState.loadingChunksDataPlayerChunk = { x: playerPosRegion.x, z: playerPosRegion.z }
+    await copyFiles(splitByCopySize(filesWithSpiral, 10))
 
     return saveRootPath
   } catch (err) {
+    console.error(err)
     void showOptionsModal(`Error while saving the world: ${err.message}`, [])
   } finally {
     setLoadingScreenStatus(undefined)
   }
 }
 
+const splitByCopySize = (files: string[], copySize = 15) => {
+  return files.reduce<string[][]>((acc, cur, i) => {
+    if (i % copySize === 0) {
+      acc.push([])
+    }
+    acc.at(-1)!.push(cur)
+    return acc
+  }, [])
+}
+
 export default () => {
   const qsParams = new URLSearchParams(window.location.search)
   const lockConnect = qsParams?.get('lockConnect') === 'true'
diff --git a/src/utils.ts b/src/utils.ts
index b3c479a9..f6a6176f 100644
--- a/src/utils.ts
+++ b/src/utils.ts
@@ -1,6 +1,6 @@
-import { hideModal, isGameActive, miscUiState, showModal } from './globalState'
+import { activeModalStack, hideModal, isGameActive, miscUiState, showModal } from './globalState'
 import { options } from './optionsStorage'
-import { appStatusState } from './react/AppStatusProvider'
+import { appStatusState, resetAppStatusState } from './react/AppStatusProvider'
 import { notificationProxy, showNotification } from './react/NotificationProvider'
 
 export const goFullscreen = async (doToggle = false) => {
@@ -139,7 +139,10 @@ export const setLoadingScreenStatus = function (status: string | undefined | nul
     return
   }
 
-  // todo update in component instead
+  if (!activeModalStack.some(x => x.reactType === 'app-status')) {
+    // just showing app status
+    resetAppStatusState()
+  }
   showModal({ reactType: 'app-status' })
   if (appStatusState.isError) {
     miscUiState.gameLoaded = false