add benchmark to readme

Author: Anton293

README.md

@@ -22,13 +22,11 @@ XPath selection for HTML in Rust. Alpha stage, expect breaking changes.
 
 ## Benchmarks
 
-![Benchmark Results](https://github.com/Anton293/microdom/blob/master/docs/assets/benchmark_results.png)
-
-| Library | Time |
-|---------|------|
-| microdom | 8.24 ms |
-| html5ever | 18.22 ms |
-| tl | 2.30 ms |
+| Library | HTML+CSS+JS ~10KB | Clean HTML ~20KB | Micro | Avg speed | Notes |
+|:---|---:|---:|---:|---:|:---|
+| **microdom** | 75 MiB/s | 81 MiB/s | 3.1 MiB/s | ~53 MiB/s | Full DOM tree |
+| **html5ever** | 26 MiB/s | 23 MiB/s | 7.8 MiB/s | ~19 MiB/s | Full DOM tree; faster on tiny docs |
+| **tl** | 190 MiB/s | 129 MiB/s | 37 MiB/s | ~119 MiB/s | ⚠️ Tag index only, not a DOM tree |
 
 
 ## Quick Start