diff --git a/backend/assets/loading.webp b/backend/assets/loading.webp
new file mode 100644
index 0000000..a8da92d
Binary files /dev/null and b/backend/assets/loading.webp differ
diff --git a/backend/config_parser.py b/backend/config_parser.py
index fe2c42b..0b35559 100644
--- a/backend/config_parser.py
+++ b/backend/config_parser.py
@@ -150,6 +150,7 @@ class Go2Rtc:
 class TranscodeTools:
     statuses:dict[str, TranscodeStatus] = {}
     WIN32PYTHON = "python-win32"
+    preview_storage = []
 
     def __init__(self, tools_directory, transcode_directory, hide_checks = True, delete_temporary_files = False) -> None:
         self.delete_temporary_files = delete_temporary_files
@@ -279,6 +280,12 @@ class TranscodeTools:
     async def processing_preview(self, file:File, nvr: NVR, ext = "webp", preview_pre_bytes = 1024 * 512):
         raw_file = file.previewPath(self.transcode_directory)
         preview_file = f"{raw_file}.{ext}"
+
+        if preview_file in self.preview_storage:
+            return preview_file
+        else:
+            self.preview_storage.append(preview_file)
+
         if os.path.exists(preview_file) and os.path.getsize(preview_file) != 0:
             self.logger.info(f"{preview_file} is exists")
             return preview_file
diff --git a/backend/server.py b/backend/server.py
index caf8e97..6e557cc 100644
--- a/backend/server.py
+++ b/backend/server.py
@@ -228,7 +228,7 @@ class Server:
                 response.status_code = 400
                 return {"ok":False, "error":e}
         @self.app.get(self.API_BASE_REF + "/preview/{recorder_index}")
-        async def getTranscodePreview(response: Response, recorder_index:int, b64:str):
+        async def getTranscodePreview(response: Response, recorder_index:int, b64:str, background_tasks: BackgroundTasks):
             try:
                 if len(b64) == 0:
                     response.status_code = 404
@@ -236,17 +236,20 @@ class Server:
 
                 file: File = File.from_b64(b64 + "==")
 
-                try:
-                    preview = await self.config.transcode_tools.processing_preview(file, None, "webp")
-                except NeedNVR:
+                async def loadPreview(file):
                     nvr:NVR = self.config.getRecorder(recorder_index).nvr
                     await nvr.login()
-                    preview = await self.config.transcode_tools.processing_preview(file, nvr, "webp")
+                    await self.config.transcode_tools.processing_preview(file, nvr, "webp")
 
-                headers = {}
-                headers.update({"Content-Length":str(os.path.getsize(preview))})
-                headers.update({"Content-Disposition": f'attachment; filename="preview.webp"'})
-                return FileResponse(preview, media_type="application/octet-stream", headers=headers)
+                try:
+                    preview = await self.config.transcode_tools.processing_preview(file, None, "webp")
+                    headers = {}
+                    headers.update({"Content-Length":str(os.path.getsize(preview))})
+                    headers.update({"Content-Disposition": f'attachment; filename="preview.webp"'})
+                    return FileResponse(preview, media_type="application/octet-stream", headers=headers)
+                except NeedNVR:
+                    background_tasks.add_task(loadPreview, file = file)
+                    return FileResponse("./assets/loading.webp")
 
             except Exception as e:
                 traceback.print_exc()
diff --git a/frontend/ang_dvrip/src/app/components/about/about.component.ts b/frontend/ang_dvrip/src/app/components/about/about.component.ts
index b99f93f..ae195ad 100644
--- a/frontend/ang_dvrip/src/app/components/about/about.component.ts
+++ b/frontend/ang_dvrip/src/app/components/about/about.component.ts
@@ -1,5 +1,6 @@
 import { Component, OnInit } from '@angular/core';
 import {ActivatedRoute} from "@angular/router";
+import {BaseUtils} from "../../utils/BaseUtils";
 
 @Component({
   selector: 'app-about',
@@ -11,6 +12,7 @@ export class AboutComponent implements OnInit {
   channel_index: number = 0;
   img: string = "";
   updated: Date = new Date();
+  baseUtils = BaseUtils;
 
   constructor(private route:ActivatedRoute) {}
 
@@ -21,7 +23,7 @@ export class AboutComponent implements OnInit {
   }
 
   getSnapshot() {
-    this.img = `/api/dvrip/snapshot/${this.recorder_index}/${this.channel_index}?timestamp=${new Date().getTime()}`
+    this.img = `/api/dvrip/snapshot/${this.recorder_index}/${this.channel_index}?timestamp=${this.baseUtils.getTime()}`
     this.updated = new Date();
   }
 
diff --git a/frontend/ang_dvrip/src/app/components/history/history.component.html b/frontend/ang_dvrip/src/app/components/history/history.component.html
index f4b9867..0f75c79 100644
--- a/frontend/ang_dvrip/src/app/components/history/history.component.html
+++ b/frontend/ang_dvrip/src/app/components/history/history.component.html
@@ -35,7 +35,7 @@
       mat-card-image
       style="cursor: pointer"
       (click)="openTransCodeDialog(element)"
-      [src]="'api/dvrip/preview/'+recorder_index+'?b64='+element.b64"
+      [src]="'api/dvrip/preview/'+recorder_index+'?b64='+element.b64+'&timestamp='+this.baseUtils.getTime()"
       alt="Превью недоступно">
     <mat-card-content>
     </mat-card-content>
@@ -48,7 +48,6 @@
       >
         <mat-icon>{{element.processing != null?'cloud_upload':element.converted?'cloud_done':'cloud_download'}}</mat-icon> {{element.processing != null?'Обработка':element.converted?'Просмотреть':'Загрузить'}}
       </button>
-      <!--<a [href]="'api/dvrip/file/'+recorder_index+'?b64='+element.b64" [class]="'raw'"><mat-icon>attachment</mat-icon></a>-->
     </mat-card-actions>
   </mat-card>
 </div>
diff --git a/frontend/ang_dvrip/src/app/utils/BaseUtils.ts b/frontend/ang_dvrip/src/app/utils/BaseUtils.ts
index fe86b25..b3e364d 100644
--- a/frontend/ang_dvrip/src/app/utils/BaseUtils.ts
+++ b/frontend/ang_dvrip/src/app/utils/BaseUtils.ts
@@ -25,4 +25,8 @@ export class BaseUtils {
       return new Date();
     }
   }
+
+  static getTime():number {
+    return new Date().getTime();
+  }
 }