Add speed statistics to linux.md.

Signed-off-by: Andrea Odetti <mariofutire@gmail.com>

linux.md

@@ -6,7 +6,12 @@
   * [applen](#applen)
   * [qapple](#qapple)
 * [Build](#build)
+  * [Checkout](#checkout)
   * [Fedora](#fedora)
+  * [Raspbian](#raspbian)
+* [Speed](#build)
+  * [Fedora](#fedora-1)
+  * [Raspbian](#raspbian-1)
 
 ## Structure
 
@@ -81,9 +86,54 @@ The project can be built using cmake from the top level directory.
 
 qapple can be managed from Qt Creator as well and the 2 have coexisted so far, but YMMV.
 
+### Checkout
+
+```
+git clone https://github.com/audetto/AppleWin.git --recursive
+cd AppleWin
+mkdir build
+cd build
+cmake ..
+make
+```
+Use `cmake -DCMAKE_BUILD_TYPE=RELEASE` to get a *release* build.
+
 ### Fedora
 
 On Fedora 31, from a fresh installation, install all packages from [fedora.list.txt](source/linux/fedora.list.txt).
 
-Building with cmake works.
+### Raspbian
 
+On Raspbian 10, from a fresh installation, install all packages from [raspbian.list.txt](source/linux/raspbian.list.txt).
+
+Audio does not work and CPU utilisation is very high.
+
+## Speed
+
+### Fedora
+
+Intel(R) Core(TM) i5-4460  CPU @ 3.20GHz
+
+Full update = 582 MHz
+
+| Video Stype | Video update |
+| :--- | ---: |
+| RGB Monitor | 39 |
+| NTSC Monitor | 27 |
+| Color TV | 25 |
+| B&W TV | 27 |
+| Amber Monitor | 31 |
+
+### Raspbian
+
+Pi 3B+
+
+Full update = 54 MHz
+
+| Video Stype | Video update |
+| :--- | ---: |
+| RGB Monitor | 5.3 |
+| NTSC Monitor | 3.6 |
+| Color TV | 2.6 |
+| B&W TV | 2.9 |
+| Amber Monitor | 4.5 |