Add PERFORMANCE.md and information about unrar7

README.md

@@ -66,6 +66,7 @@ QNAP packages are available as native / buildroot packages or via [sherpa](https
 
 ## Brief introduction on how to use NZBGet
  - [How to use](docs/HOW_TO_USE.md)
+ - [Performance tips](docs/PERFORMANCE.md)
 
 ## Contribution
 

docker/README.md

@@ -128,6 +128,8 @@ Unrar 7 built with next march parameters:
 - arm64:  armv8-a+crypto+crc
 - armhf:  armv7-a
 
+More information about unrar performance: [Performance tips](https://github.com/nzbgetcom/nzbget/blob/develop/docs/PERFORMANCE.md#unrar)
+
 # Native unrar 7 build support
 
 To build image on hardware which support crypto acceleration with native-optimized unrar can be used docker-compose like this (also needed entrypoint.sh and Dockerfile from [official repository](https://github.com/nzbgetcom/nzbget/tree/develop/docker)):

docs/PERFORMANCE.md

@@ -0,0 +1,44 @@
+# NZBGet performance tips (WIP)
+
+## Unrar
+
+Unrar from version 7 provides improved performance when extracting encrypted archives, especially when built with optimized march.
+
+Several tests (`time unrar -p<password> x <archive>`, archive size ~1.6Gb):
+
+- arm64 (Mac mini M2)
+  - unrar 6.24
+    ```
+    real    0m 27.71s
+    user    0m 25.00s
+    sys     0m 1.41s
+    ```
+  - unrar 7.0 march=armv8-a
+    ```
+    real    0m 11.04s
+    user    0m 9.28s
+    sys     0m 1.19s
+    ```
+  - unrar 7.0 march=armv8-a+crypto+crc
+    ```
+    real    0m 6.04s
+    user    0m 3.59s
+    sys     0m 1.48s
+    ```
+
+- x86_64 (Intel Xeon E3-1265L V2)
+  - unrar 6.24
+    ```
+    real    0m 13.51s
+    user    0m 12.08s
+    sys     0m 1.27s
+    ```
+  - unrar7 (march=x86-64-v2)
+    ```
+    real    0m 6.13s
+    user    0m 5.34s
+    sys     0m 1.90s
+    ```
+
+Extraction speed is increased by ~2x and ~4.5x when using the optimized binary.
+The NZBGet docker container includes unrar6 (used by default, for most compatibility), and an optimized unrar7 (can be enabled in the settings). More information can be found in [Docker readme](../docker/README.md#unrar-7-support)