add raspberry pie benchmarks

README.md

@@ -147,17 +147,20 @@ Columns define the current directory where the prompt was rendered.
   * `~/nerd-fonts` -- [nerd-fonts](https://github.com/ryanoasis/nerd-fonts) git repo
     with 4k files.
 
+Here's how the prompt looked like during benchmarking.
+
+![](https://raw.githubusercontent.com/romkatv/powerlevel10k/master/prompt.png)
+
+It was identical in Powerlevel10k and Powerlevel9k. Even though Powerlevel10k can dynamically
+switch to async prompts, it wasn't happening here because latencies were low. Prompts with both
+themes were essentially synchronous with every prompt having up-to-date git info.
+
 _This table used to have another column for Linux kernel git repo, which is massive. It's
 been removed because it's not a fair comparison. Powerlevel10k automatically detects that
 fetching git status is slow and switches to async prompt generation, which allows it to
 achieve 2 ms prompt latency but not all its prompt have up-to-date git info. Those that don't,
 have vcs segment greyed out._
 
-Here's how the prompt looked like during benchmarking (identical by design in Powerlevel9k and
-Powerlevel 10k):
-
-![](https://raw.githubusercontent.com/romkatv/powerlevel10k/master/prompt.png)
-
 Configuration that was used:
 
 ```zsh
@@ -176,6 +179,9 @@ POWERLEVEL9K_BACKGROUND_JOBS_BACKGROUND=orange1
 POWERLEVEL9K_BACKGROUND_JOBS_FOREGROUND=black
 
 function custom_rprompt() echo -E "hello world"
+
+sleep 86400 &  # spawn two background jobs
+sleep 86400 &
 ```
 
 Here's the same benchmark for Windows Subsystem for Linux (WSL) with zsh running in the standard
@@ -191,6 +197,22 @@ Command Prompt (`cmd.exe`).
 
 The fastests results are probably limited by the key repeat rate.
 
+Here's Raspberry Pie 3. I replaced [nerd-fonts](https://github.com/ryanoasis/nerd-fonts) repo with
+[git](https://github.com/git/git) in this benchmark becase the former didn't fit on my SD card.
+Git repo had 3.6k files, so about the same size. I set `POWERLEVEL9K_VCS_MAX_SYNC_LATENCY_SECONDS=1`
+to prevent Powerlevel10k from switching to async prompts. The default threshold is 0.05, or 50 ms,
+after which Powerlevel10k will go async (git latency in ~/git was close to 100 ms, so above the
+default 50 ms). Naturally, async is a good thing, so you shouldn't disable it in your configs. I
+only did it to measure sync latency.
+
+| Theme               | /         | ~/git      |
+|---------------------|----------:|-----------:|
+| powerlevel9k/master |    312 ms |     584 ms |
+| **powerlevel10k**   | **15 ms** | **108 ms** |
+| naked zsh           |      1 ms |       1 ms |
+
+The `next` branch of Powerlevel9k didn't work on Raspberry Pie, so I couldn't benchmark it.
+
 ## What's the catch?
 
 Really, there is no catch. It's literally the same prompt with the same flexibility